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-   -   k=22544089918041953*E(130) generates 216 known primes (https://www.mersenneforum.org/showthread.php?t=18407)

 Thomas11 2013-07-30 17:17

k=22544089918041953*E(130) generates 216 known primes

1 Attachment(s)
Perhaps some of you may have noticed the recent progress in the [URL="http://www.mersenneforum.org/showthread.php?t=9755"]Very Prime Riesel and Sierpinski k thread[/URL] started by Robert Smith.

About one month ago Robert found a Riesel k, a so called VPS (Very Prime Series), for which we discovered [B]201 primes[/B] so far (up to n=480k).
This is quite extraordinary, since there are no other known series with 200 primes so far (actually no other series has 183 or more known primes).

Since our resources are limited we are offering this k to the RPS community.

The candidate is [B]k=22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131[/B] (=1480472640274704456611717878515654164205), a 40 digits number. Its [B]Nash weight is 8818[/B] (= "very high").

[STRIKE]LLR cannot handle such large values of k, therefore one has to use PFGW.[/STRIKE]
A single LLR test or a PRP test using PFGW typically takes 4-5 times as long as a LLR test for an "ordinary" k of 3-5 digits having the same n.

The attached file contains the range n=500-800k sieved up to p=6.34T, which should keep us busy for a while. Please help yourself to pick a suitable range for your machine(s).

Well, there would be no Top5000 credit for primes found in this range.
But with your help we could drive this k into the megabit range quite soon!

[B]Status[/B]
[CODE] Range Tested by Status
1-250,000 - Robert - Complete (191 primes)
250,001-500,000 - Thomas - Complete (14 primes)
500,001-600,000 - Lennart - Complete (4 primes)
600,001-610,000 - Antonio - Complete (2 primes)
610,001-612,000 - lsoule - Complete
612,001-614,000 - Robert - Complete
614,001-620,000 - lsoule - Complete
620,001-630,000 - Batalov - Complete
630,001-635,000 - Antonio - Complete
635,001-640,000 - lsoule - Complete (1 prime)
640,001-730,000 - Batalov - Complete (1 prime)
730,001-732,000 - Kosmaj - Complete
732,001-740,000 - lsoule - Complete
740,001-742,000 - Antonio - Complete
742,001-750,000 - lsoule - Complete
750,001-770,000 - Thomas - Complete
770,001-775,000 - Antonio - Complete
775,001-780,000 - Trilo - Complete
780,001-790,000 - lsoule - Complete (1 prime)
790,001-792,000 - Robert - Complete
792,001-810,000 - lsoule - Complete
810,001-814,000 - Robert - Complete
814,001-840,000 - lsoule - Complete (1 prime)
840,001-842,000 - Robert - Complete
842,001-880,000 - lsoule - Complete
880,001-882,000 - Robert - In Progress
882,001-890,000 - lsoule - Complete
890,001-904,000 - lsoule - Complete

1,000,001-1,030,000 - Batalov - Complete (1 prime)
[/CODE]

[B]Input files[/B] (in the attached 22544.zip file):
22544mi790to800sv_6340B.txt ... pfgw input file in ABC format (790-800k)
22544mi800to1000sv_9600B.txt ... pfgw input file in ABC format (800-1000k)
llr_input_790to1000.txt ... LLR input file in NewPgen format (790-1000k)
llr_input_1030to1200.txt ... LLR input file in NewPgen format (1030-1200k)

 robert44444uk 2013-07-30 17:30

I think it would be best to take 2,000 n blocks to begin with. For example 500-502.

I am just finishing off 228,000-250,000, and Thomas11 has a little bit to do in his range, and therefore there may be more than 201 primes at 500000.

 firejuggler 2013-07-30 17:50

A test at n=500,000 take about 520 seconds, on a 2500K at stock clock.

 Thomas11 2013-07-31 07:53

This morning another prime (actually a PRP) popped up for [B]n=496187[/B].

[B]202 primes[/B] now!

 robert44444uk 2013-07-31 10:02

I have posted the discovery this morning on the Yahoo Primeform group, with a short history of the search.

[URL]http://tech.groups.yahoo.com/group/primeform/message/11407[/URL]

the primes found to date:

[CODE]1 1
2 2
3 11
4 14
5 16
6 36
7 41
8 52
9 53
10 64
11 65
12 73
13 75
14 80
15 91
16 124
17 131
18 140
19 156
20 158
21 166
22 170
23 189
24 194
25 223
26 224
27 233
28 240
29 250
30 275
31 284
32 288
33 354
34 374
35 405
36 478
37 486
38 489
39 498
40 500
41 521
42 527
43 556
44 562
45 591
46 596
47 623
48 642
49 643
50 650
51 708
52 802
53 839
54 850
55 867
56 883
57 960
58 985
59 1003
60 1070
61 1108
62 1173
63 1207
64 1238
65 1276
66 1322
67 1361
68 1374
69 1375
70 1509
71 1570
72 1592
73 1636
74 1717
75 1720
76 1800
77 1808
78 1999
79 2150
80 2251
81 2352
82 2373
83 2550
84 2576
85 2596
86 2692
87 2697
88 2791
89 2956
90 3076
91 3178
92 3325
93 3590
94 4221
95 4327
96 4344
97 4385
98 4505
99 4585
100 4913
101 5217
102 5599
103 6478
104 6864
105 7089
106 7106
107 8140
108 8382
109 8528
110 8784
111 8787
112 9399
113 11069
114 11311
115 11853
116 14292
117 15198
118 15320
119 15825
120 15999
121 17570
122 17840
123 17887
124 17935
125 18401
126 20262
127 20460
128 20503
129 22568
130 22887
131 25002
132 26252
133 26523
134 27251
135 28233
136 29803
137 30173
138 31212
139 31424
140 32583
141 33696
142 36106
143 36320
144 40172
145 42457
146 44900
147 46170
148 46787
149 47920
150 49784
151 53246
152 55579
153 59638
154 60260
155 64574
156 67190
157 67470
158 71221
159 73142
160 77776
161 80678
162 84684
163 87557
164 96045
165 102231
166 102651
167 104202
168 104655
169 111235
170 111239
171 118689
172 119254
173 129630
174 134337
175 134490
176 141805
177 146149
178 159874
179 163330
180 168072
181 174712
182 177119
183 177684
184 190958
185 193804
186 197942
187 210616
188 226559
189 227776
190 229069
191 245288
192 255530
193 294807
194 318934
195 334623
196 334645
197 363020
198 376732
199 403709
200 414907
201 449150
202 472040
203 479697
204 496187
205 498496
206 517692
207 531133
208 549598
209 587833
210 608207
211 608462
212 639888
213 716611
214 788439
215 834442

216 1025897
[/CODE][B]Current total: 216 primes[/B]

 robert44444uk 2013-07-31 12:57

190th prime...203 overall

The table I published is out of date again.

[B]190 229069[/B]

That makes 203 primes to date

 robert44444uk 2013-07-31 12:59

[QUOTE=firejuggler;347787]A test at n=500,000 take about 520 seconds, on a 2500K at stock clock.[/QUOTE]

Or 2.5 days per range of 2000 n, which has about 400 tests

 firejuggler 2013-07-31 13:10

I'll do some work when I come back(mid august). Right now, my core are used.

 Lennart 2013-07-31 18:10

Reserving
500,001-600,000 - Lennart

 kar_bon 2013-07-31 18:34

I've updated my [url=http://www.rieselprime.de/Related/RieselPayam.htm]Riesel-Payam page[/url] with this record holder.

 Thomas11 2013-07-31 22:20

Another prime found: [B]204? 498496[/B] :smile:

250,001-500,000 completed (14 primes).

 Antonio 2013-08-01 07:39

Reserving
600,001-610,000

 robert44444uk 2013-08-06 09:12

Now 205 primes

Welcome to the new searchers!

I expect that Carlos Rivera will update the puzzle page within the next day or so

[url]http://www.primepuzzles.net/puzzles/puzz_006.htm[/url]

In the meanwhile another prime to announce:

[B]191? 245288[/B]

this means the mooted 200th is now 414907

 robert44444uk 2013-08-08 17:37

No more primes in the 200-250K range - this is now complete.

 lsoule 2013-08-09 14:27

Taking 610-612.

 Antonio 2013-08-11 15:13

Result

n=608207 is prime :smile:

[CODE]
Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^608207-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 41, base 1+sqrt(41)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^608207-1 is prime! (1740.1047s+0.0191s)
[/CODE]

 Antonio 2013-08-12 02:31

Result

n=608462 is prime

[CODE]
Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^608462-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 47, base 1+sqrt(47)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^608462-1 is prime! (1657.1454s+0.0030s)

[/CODE]

 robert44444uk 2013-08-12 11:18

OMG, well done Antonio...207 primes and counting.

I'll take 612-614K

 lsoule 2013-08-12 15:41

610-612 complete, no primes.
Taking 614-620.

 Antonio 2013-08-12 18:34

[QUOTE=robert44444uk;349243]OMG, well done Antonio...207 primes and counting.
[/QUOTE]

Didn't think I was going to get anything, but it's just like waiting for a bus - wait ages for one and two come together. :rolleyes:

 Lennart 2013-08-12 18:39

Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^531133-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^531133-1 is prime! (1873.5388s+0.0074s)

Lennart

 Batalov 2013-08-12 19:06

I'll take 620-630, for kicks and giggles.

 robert44444uk 2013-08-13 09:37

[QUOTE=Lennart;349279]Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^531133-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^531133-1 is prime! (1873.5388s+0.0074s)

Lennart[/QUOTE]

Well done Lennart, that's 208!!

 Antonio 2013-08-13 19:55

600,001-610,000 Range complete (2 Primes already reported)

Taking 630-635

 lsoule 2013-08-13 23:31

614-620 complete, no primes.
Taking 635-640.

 lsoule 2013-08-15 00:42

Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^639888-1 [N+1, Brillhart-Lehmer-Self
ridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^639888-1 is prime! (7410.2605s+0.0208s)

 Batalov 2013-08-15 01:01

Will update on 620-630 here - almost done.

Taking 640-650.

 Batalov 2013-08-15 05:15

Taking 650-680.

 robert44444uk 2013-08-15 09:04

[QUOTE=lsoule;349597]Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^639888-1 [N+1, Brillhart-Lehmer-Self
ridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^639888-1 is prime! (7410.2605s+0.0208s)[/QUOTE]

This one will run and run! 209!!!

[QUOTE=robert44444uk;347841]I have posted the discovery this morning on the Yahoo Primeform group, with a short history of the search.

[url]http://tech.groups.yahoo.com/group/primeform/message/11407[/url]

the primes found to date:

[CODE]

1 1
2 2
3 11
4 14
5 16
6 36
7 41
8 52
9 53
10 64
11 65
12 73
13 75
14 80
15 91
16 124
17 131
18 140
19 156
20 158
21 166
22 170
23 189
24 194
25 223
26 224
27 233
28 240
29 250
30 275
31 284
32 288
33 354
34 374
35 405
36 478
37 486
38 489
39 498
40 500
41 521
42 527
43 556
44 562
45 591
46 596
47 623
48 642
49 643
50 650
51 708
52 802
53 839
54 850
55 867
56 883
57 960
58 985
59 1003
60 1070
61 1108
62 1173
63 1207
64 1238
65 1276
66 1322
67 1361
68 1374
69 1375
70 1509
71 1570
72 1592
73 1636
74 1717
75 1720
76 1800
77 1808
78 1999
79 2150
80 2251
81 2352
82 2373
83 2550
84 2576
85 2596
86 2692
87 2697
88 2791
89 2956
90 3076
91 3178
92 3325
93 3590
94 4221
95 4327
96 4344
97 4385
98 4505
99 4585
100 4913
101 5217
102 5599
103 6478
104 6864
105 7089
106 7106
107 8140
108 8382
109 8528
110 8784
111 8787
112 9399
113 11069
114 11311
115 11853
116 14292
117 15198
118 15320
119 15825
120 15999
121 17570
122 17840
123 17887
124 17935
125 18401
126 20262
127 20460
128 20503
129 22568
130 22887
131 25002
132 26252
133 26523
134 27251
135 28233
136 29803
137 30173
138 31212
139 31424
140 32583
141 33696
142 36106
143 36320
144 40172
145 42457
146 44900
147 46170
148 46787
149 47920
150 49784
151 53246
152 55579
153 59638
154 60260
155 64574
156 67190
157 67470
158 71221
159 73142
160 77776
161 80678
162 84684
163 87557
164 96045
165 102231
166 102651
167 104202
168 104655
169 111235
170 111239
171 118689
172 119254
173 129630
174 134337
175 134490
176 141805
177 146149
178 159874
179 163330
180 168072
181 174712
182 177119
183 177684
184 190958
185 193804
186 197942
187 210616
188 226559
189 227776
190 229069
191 245288
192 255530
193 294807
194 318934
195 334623
196 334645
197 363020
198 376732
199 403709
200 414907
201 449150
202 472040
203 479697
204 496187
205 498496

206 531133

207 608207
208 608462

209 639888
[/CODE]

[B]Current total: 209 primes[/B][/QUOTE]
How reliable is pfgw pl?
A.K. Devaraj

 Thomas11 2013-08-15 14:07

[QUOTE=devarajkandadai;349650]How reliable is pfgw pl?
A.K. Devaraj[/QUOTE]

What do you mean by "reliable"?

Due to the size of k we run a PRP test first instead of a more demanding primality test (Brillhart-Lehmer-Selfridge). For a positive PRP test the BLS test is done manually afterwards. If it turns out prime, then it should be as "reliable" as if it would have been done by any other primality testing software (like LLR, Proth, Prime95, even if the latter are unable to test those numbers).

 Batalov 2013-08-15 15:27

Taking 680-720.

 lsoule 2013-08-15 17:03

635-640 complete with the one prime reported.

 Jean Penné 2013-08-15 19:09

[QUOTE=Thomas11;349655]What do you mean by "reliable"?

Due to the size of k we run a PRP test first instead of a more demanding primality test (Brillhart-Lehmer-Selfridge). For a positive PRP test the BLS test is done manually afterwards. If it turns out prime, then it should be as "reliable" as if it would have been done by any other primality testing software (like LLR, Proth, Prime95, even if the latter are unable to test those numbers).[/QUOTE]
It is not true that LLR cannot test these numbers : Indeed, it cannot process the input file in ABC format, but it can process it in Newpgen format (k*2^n-1 whith k fixed) with k as a digit string, not in factorized form :

1:M:1:2:2
1480472640274704456611717878515654164205 1
1480472640274704456611717878515654164205 2
1480472640274704456611717878515654164205 11
1480472640274704456611717878515654164205 14
1480472640274704456611717878515654164205 16
1480472640274704456611717878515654164205 36
....................................................................
....................................................................
1480472640274704456611717878515654164205 498496
1480472640274704456611717878515654164205 531133
1480472640274704456611717878515654164205 608207
1480472640274704456611717878515654164205 608462
1480472640274704456611717878515654164205 639888

I am presently verifying successfully your prime results with LLR
Regards,
Jean

 Thomas11 2013-08-15 19:37

[QUOTE=Jean Penné;349691]It is not true that LLR cannot test these numbers : Indeed, it cannot process the input file in ABC format, but it can process it in Newpgen format (k*2^n-1 whith k fixed) with k as a digit string, not in factorized form : ...

I am presently verifying successfully your prime results with LLR
Regards,
Jean[/QUOTE]

Thanks for this information, Jean! This is really good news!

Many years ago I tried larger k in LLR and noticed that there was some limitation (maybe k<2^53, I can't remember).

What is the current size limit for k in LLR?

 Thomas11 2013-08-15 19:50

1 Attachment(s)
Here is for convenience the input file in NewPGen format needed for LLR. Please help yourself to cut out your ranges.

It would be nice if some of you could post some comparative timings for LLR and PFGW (PRP test).

BTW.: I'm already running a new sieve for the candidates up to n=1M (I've completely underestimated your interest and machinery in this sub-project). The new sieve file will be ready for testing around Monday next week.

 Batalov 2013-08-15 20:42

22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^716611-1 is prime

 Batalov 2013-08-15 21:01

Taking 720-730.

 pepi37 2013-08-15 21:24

[QUOTE=Thomas11;349704]Here is for convenience the input file in NewPGen format needed for LLR. Please help yourself to cut out your ranges.

It would be nice if some of you could post some comparative timings for LLR and PFGW (PRP test).

BTW.: I'm already running a new sieve for the candidates up to n=1M (I've completely underestimated your interest and machinery in this sub-project). The new sieve file will be ready for testing around Monday next week.[/QUOTE]
Starting Lucas Lehmer Riesel prime test of 1480472640274704456611717878515654164205*2^498496-1
Using generic reduction AVX FFT length 48K, Pass1=256, Pass2=192
V1 = 5 ; Computing U0...done.

1480472640274704456611717878515654164205*2^498496-1 is prime! Time : 395.696 sec.

I7-2700K at 4 GHz

 Batalov 2013-08-15 23:58

1 Attachment(s)
All done. (Attached)

 Jean Penné 2013-08-16 06:12

[QUOTE=Thomas11;349698]Thanks for this information, Jean! This is really good news!

Many years ago I tried larger k in LLR and noticed that there was some limitation (maybe k<2^53, I can't remember).

What is the current size limit for k in LLR?[/QUOTE]

For k > 2^53, the use of generic modular reduction is required, so the calculus becomes 3 times slower, but it is due do the gwnum library usage, and PFGW has the same limitation!

Regards,
Jean

 Kosmaj 2013-08-16 07:29

My LLR ver. 3.8.8 on a 64bit Mac was crashing on these numbers, but ver. 3.8.9 works fine.

Exe times:
n=498496, 424 sec
n=730004, 965 sec (FFT len = 72k)

The CPU is I5 at 2.7GHz (only one LLR client running on a 4-core machine)

 robert44444uk 2013-08-16 09:29

Good to see LLR can be used..here are my comparative times:

pfgw:

22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^612375-1 is composite: RES64: [29838CC7648D40C8] (930.6872s+0.1715s)

LLR:
1480472640274704456611717878515654164205*2^612377-1 is not prime. LLR Res64: 1B0F6C3C8C558D4F Time : 800.448 sec

Well done Batalov on doing a huge chunk of work, and a prime to boot. 210!!!

 Kosmaj 2013-08-16 11:40

Taking 730-732.

 Lennart 2013-08-16 12:08

Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^517692-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
Generic modular reduction using generic reduction AVX FFT length 50K, Pass1=640, Pass2=80 on A 517824-bit number
Calling Brillhart-Lehmer-Selfridge with factored part 99.97%
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^517692-1 is prime! (1788.9399s+0.0009s)

Lennart

 Batalov 2013-08-16 15:33

I ksieve'd for a day (to 1T only, n=1-1.2M) in the recordable range* and added this prime to the collection:
[URL="http://primes.utm.edu/primes/page.php?id=115092"]22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2[SUP]1025897[/SUP]-1[/URL]

I'll post the rest of the sieve, later. Will possibly sieve and run some more.

 Kosmaj 2013-08-16 16:17

Hi Batalov,

Congrats on a nice prime!
Can you also include RPS in your new prover's code?

Thanks!

 Batalov 2013-08-16 17:18

k=22544089918041953*E(130)

Sure thing. I emailed C.C. (and added a comment to the prime, too).

I put the asterisk in my morning message, but forgot to post the footnote. It is this:
_______________________
*Note that the Top-5000 [URL="http://primes.utm.edu/primes/page.php?rank=5000"]cutoff plane[/URL] will pass exactly 1,000,000 bits today or tomorrow. For the record, right now it is still at 999,400 bits' size, but the 1,290,000-bits abominable primes keep on pouring in. Mark my words :paul: Next state of the Top5000 database will be that [B][I]all[/I][/B] primes from position ~1,500 to 5,000 will be ~1,290,000 bits.

 pinhodecarlos 2013-08-16 17:23

[QUOTE=Thomas11;349704]Here is for convenience the input file in NewPGen format needed for LLR. Please help yourself to cut out your ranges.

It would be nice if some of you could post some comparative timings for LLR and PFGW (PRP test).

BTW.: I'm already running a new sieve for the candidates up to n=1M (I've completely underestimated your interest and machinery in this sub-project). The new sieve file will be ready for testing around Monday next week.[/QUOTE]

Please update first post attachment.
[url]http://www.mersenneforum.org/showpost.php?p=349704&postcount=36[/url]

 ATH 2013-08-16 18:36

LLR vs PFGW timings on 1480472640274704456611717878515654164205*2^716611-1:

[B]Laptop i7 2720QM 2.20 Ghz:[/B]

[U]LLR 3.8.9:[/U]
Lucas Lehmer Riesel prime test: 1115 sec (deterministic)
Strong Fermat PRP: 1422 sec
Lucas PRP: 2837 sec
Frobenius PRP: 1300 sec

[U]PFGW 3.7.7:[/U]
Strong Fermat PRP: 1215 sec
[N-1, Brillhart-Lehmer-Selfridge] 1973 sec (still came out PRP even if it should be deterministic)

[B]Q9450(Yorksfield) 2.66 Ghz:[/B]

[U]LLR 3.8.9:[/U]
Lucas Lehmer Riesel prime test: 2193 sec
Strong Fermat PRP: 2179 sec
Lucas PRP: 4746 sec
Frobenius PRP: 2179 sec

[U]PFGW 3.7.7:[/U]
Strong Fermat PRP: 2229 sec
[N-1, Brillhart-Lehmer-Selfridge] 3350 sec (came out as PRP)

 Batalov 2013-08-16 18:41

Taking 1000-1030, for the record.

 ATH 2013-08-16 20:17

[QUOTE=Jean Penné;349771]For k > 2^53, the use of generic modular reduction is required, so the calculus becomes 3 times slower, but it is due do the gwnum library usage, and PFGW has the same limitation!

Regards,
Jean[/QUOTE]

The slowdown seems to happen at a very specific k-value near 7.5*10[sup]14[/sup] or ~2[sup]49.4[/sup]:

750599937895082*2^498496-1, iteration : 10000 / 498497 [2.00%]. Time thusfar : 2.700 sec.
750599937895083*2^498496-1, iteration : 10000 / 498496 [2.00%]. Time thusfar : 9.986 sec.

750599937895081*2^716611-1, iteration : 10000 / 716611 [1.39%]. Time thusfar : 4.459 sec.
750599937895083*2^716611-1, iteration : 10000 / 716611 [1.39%]. Time thusfar : 15.067 sec.

750599937895086*2^1025897-1, iteration : 10000 / 1025898 [0.97%]. Time thusfar: 5.908 sec.
750599937895087*2^1025897-1, iteration : 10000 / 1025897 [0.97%]. Time thusfar: 21.928 sec.

 Kosmaj 2013-08-16 22:45

I added the LLR input file (in the n=730-800k range only) to the zip file in the top post.

BTW, if you find a reportable prime using LLR please give credit to ksieve instead of srsieve/Psieve.

 lsoule 2013-08-16 23:20

Taking 732-740

 Batalov 2013-08-17 07:06

1 Attachment(s)
[QUOTE=Batalov;349829]Taking 1000-1030, for the record.[/QUOTE]
Done. Attached.

(There's probably ~5-8% avoidable tests there; the input list was only sieved to 1T. With more sieving, there would be only ~1933 tests per each range of 10k; in the attached file, there are ~2090 per 10k.)

 Kosmaj 2013-08-17 23:58

The discussion about Top-5000 cutoff moved to a new thread:

[QUOTE=Batalov;349979]Sure thing. I emailed C.C. (and added a comment to the prime, too).

I put the asterisk in my morning message, but forgot to post the footnote. It is this:
_______________________
*Note that the Top-5000 [URL="http://primes.utm.edu/primes/page.php?rank=5000"]cutoff plane[/URL] will pass exactly 1,000,000 bits today or tomorrow. For the record, right now it is still at 999,400 bits' size, but the 1,290,000-bits abominable primes keep on pouring in. Mark my words :paul: Next state of the Top5000 database will be that [B][I]all[/I][/B] primes from position ~1,500 to 5,000 will be ~1,290,000 bits.[/QUOTE]

 robert44444uk 2013-08-18 11:09

The candidate is perhaps the first as well with 100 primes known wearing its base 4 mask. Interestingly out of the 212 primes found, 119 are translatable to base 4, and only 93 not.

I have a hunch that the mismatch is not random. Base 4 is an extremely interesting base to analyse. It is the first square base, and resultant on that no prime p has modulo of p-1.

Generalised cunningham chains in square bases provide longer chains, and I think this is related to the last statement.

 Thomas11 2013-08-18 17:11

I stopped the sieve for n=800-1000k at p=9.6T (which is more than optimal) and updated the zip file (22544.zip) in the top post.

Sieving n=1.03-2M is already in progress...

 Lennart 2013-08-18 18:23

Output logging to file pfgw.out
Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^587833-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
Generic modular reduction using generic reduction AVX FFT length 60K, Pass1=320, Pass2=192 on A 587965-bit number
Calling Brillhart-Lehmer-Selfridge with factored part 99.98%
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^587833-1 is prime! (2335.9659s+0.0007s)

Lennart

 Antonio 2013-08-19 15:18

630000-635000 range completed - no primes.

 lsoule 2013-08-19 20:44

732-740 complete, no primes

 Lennart 2013-08-21 00:06

Primality testing 22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^549598-1 [N+1, Brillhart-Lehmer-Selfridge]
Running N+1 test using discriminant 7, base 1+sqrt(7)
Generic modular reduction using generic reduction AVX FFT length 60K, Pass1=320, Pass2=192 on A 549730-bit number
Calling Brillhart-Lehmer-Selfridge with factored part 99.98%
22544089918041953*3*5*11*13*19*29*37*53*59*61*67*83*101*107*131*2^549598-1 is prime! (1954.0706s+0.0007s)

Lennart

 Antonio 2013-08-21 06:18

Taking 740-742

 Lennart 2013-08-22 06:18

500,001-600,000 Complete
4 Primes found

Lennart

 robert44444uk 2013-08-22 08:20

[QUOTE=Lennart;350435]500,001-600,000 Complete
4 Primes found

Lennart[/QUOTE]

Congrats to all the searchers, and well done Lennart. Let's get this done to 1 megabit and then we are in business with the top 5000.

 lsoule 2013-08-22 20:18

Taking 742-750

 Thomas11 2013-08-24 15:38

Taking 750-760.

 Thomas11 2013-08-25 07:20

Also taking 760-770.

 Antonio 2013-08-25 07:48

740-742 Range complete, no primes.

Taking 770-775

 Trilo 2013-08-25 23:47

Ill take 775k- 780k

 Kosmaj 2013-08-26 00:01

730-732 complete, no primes.

 lsoule 2013-08-26 20:48

742-750 complete, no primes.
Taking 780-790.

 robert44444uk 2013-08-27 07:59

612 to 614 complete. No primes found

 lsoule 2013-08-28 21:11

1480472640274704456611717878515654164205*2^788439-1 is prime!

 lsoule 2013-08-29 14:21

780-790 complete, 1 prime reported above.

 robert44444uk 2013-09-02 08:46

I'll take 790 to 792

Regards

Robert

 Thomas11 2013-09-02 19:07

750-770 complete, no primes.

I've updated the input files in the top post of this thread.
The ZIP file now additionally contains the range [B]n=1030-1200k[/B], sieved up to p=12.4T.

 Antonio 2013-09-04 18:26

770-775 Range complete, no primes.

 Trilo 2013-09-05 01:43

775k-780k completed, no primes

 lsoule 2013-09-10 17:39

I'll take 792-800

 lsoule 2013-09-13 14:02

792-800 complete, no primes.

 lsoule 2013-10-08 21:17

Taking 800-810.

 lsoule 2013-10-11 19:13

800-810 complete, no primes.

 robert44444uk 2013-10-16 17:39

790 to 792 complete. No primes.

 robert44444uk 2013-10-21 09:17

Taking 810 to 812

 robert44444uk 2013-11-25 11:44

810 to 812 completed, no primes.

Taking 812 to 814.

It is taking me ages to run a range as I don't have access to a computer except during work hours.

If anyone is able to devote some resources to getting to 1000K this would be more than appreciated. Then the search goes into the 5000 top prime list mode.

 lsoule 2013-12-05 22:11

Taking 814-820

 lsoule 2013-12-09 18:34

814-820 complete, no primes.
Taking 820-830.

 lsoule 2013-12-12 18:59

820-830 complete, no primes.

 lsoule 2014-01-17 16:58

Taking 830-840.

 robert44444uk 2014-01-22 11:35

Thank you lsoule for your support.

I do fear we are falling behind the race to catch up with the top 5000. Any other resources people have to throw at this would be really appreciated, even if it means starting at 1.1 million.

812 - 814 at long last completed. No primes.

I'll take 840-842 next.

Regards

Robert

 lsoule 2014-01-24 18:33

I'll take 842-850 as well.

 lsoule 2014-02-03 15:09

842-850 complete, no primes. 830-840 still chugging away on a slower batch of machines. I'll take 850-860.

 lsoule 2014-02-06 16:31

woo-hoo, one more popped out
1480472640274704456611717878515654164205*2^834442-1 is prime!

 firejuggler 2014-02-07 13:51

congratz!

 robert44444uk 2014-02-10 14:28

[QUOTE=lsoule;366305]woo-hoo, one more popped out
1480472640274704456611717878515654164205*2^834442-1 is prime![/QUOTE]

Yay, this was a long gap in terms of time from the last prime!! Well done that lsoule.

 lsoule 2014-02-11 21:24

830-840 and 850-860 are now complete with the one prime reported.

Taking 860-870.

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