-   Riesel Prime Search (
-   -   Riesel Primes k*2^n-1, k<300 [Part II] (

VBCurtis 2009-06-22 17:37

109 is complete to 1M.

Kosmaj 2009-06-23 22:47

k=161 and 163 at 910k.

k=193 and 277 at 950k.

Cruelty 2009-06-30 18:04

Status report
k=25 tested till n=2.19M
k=59 tested till n=3.01M
k=101 tested till n=1.99M
k=151 tested till n=1.99M
k=233 tested till n=1.25M
k=283 tested till n=1.25M
k=299 tested till n=1.25M

I am still working on those.

Cruelty 2009-07-02 10:04

Reserving k=43 - until I find a prime for it :smile:

Cruelty 2009-07-30 12:02

Reserving the following k:[LIST][*]from n=1.7M: 51, 57, 61, 65, 87[*]from n=1M: 111, 115, 117, 119, 125, 129, 135, 149, 155, 157, 165, 175, 179, 185, 191, 209, 213, 215, 229, 231, 237, 241, 249, 261, 265, 267, 271, 273, 279, 285, 291, 293[*]from n=1.12M: 79, 83, 89, 91 [*]k=73 from n=2M[*]k=75 from n=1.5M[/LIST]Total of 43 k.
The purpose of this reservation is sieving with upper limit of n=5M (afterwards we can launch an RPS drive based on this). Preliminary sieve file ready till p=2T should be ready in the first half of September, and at that time I will welcome any support in this effort :smile:
Initial target depth is p=50T which should be sufficient at least till n=2M.

VBCurtis 2009-07-30 17:23

Please add 201 to the sieve, though I wish to keep it reserved for myself. I am nearly done to 1.2M, and was just about to start a new sieve for it; please start it at 1.2M. I will assist with sieving as always.

You will find that 50T is not nearly enough sieving to even start testing- with such a large sieve, efficiency rises quite a lot. I won't be surprised if 300T is optimal for 1.2M candidates, for instance. It does make sense to run one sieve to save overall effort, even though it will be slow going.

For comparison, I have a 5-k sieve (11,13,31,45,99) going to n=4M. At 370T, I just pulled out candidates below 2M for LLR work. With 43 k's and n=5M, I imagine optimal depth for n=2M would be close to 1P. This is a very very big project.

em99010pepe 2009-07-30 21:19

I'm willing to help you sieving. When you're done just send me a PM.

Cruelty 2009-07-31 07:16

I will add k=201 from n=1.2M @ p=2T.

Cruelty 2009-07-31 11:56

Status report
k=25 tested till n=2.21M
k=43 sieving
k=59 tested till n=3.11M :furious:
k=101 tested till n=2.02M
k=151 tested till n=2.02M
k=233 tested till n=1.28M
k=283 tested till n=1.28M
k=299 tested till n=1.28M

I am still working on those.

em99010pepe 2009-08-04 07:59


I few years ago I asked Bliss help for sieving k=223 from 2M to 3M but I only have the factors from 6.26T to 100T. Do you want them? I only ask people if they find a prime to share at least one with him.


Cruelty 2009-08-04 13:26

Please send it to me (I'll PM you my e-mail address). I'll sieve the missing part below 6.26T and hopefully find a prime to share it with Bliss :smile:

em99010pepe 2009-08-04 13:28

Please send it to me (I'll PM you my e-mail address). I'll sieve the missing part below 6.26T and hopefully find a prime to share it with Bliss :smile:[/quote]

Sent. Enjoy.

Kosmaj 2009-08-09 02:32

Recent Progress
k=7 at 2.3M

k=21 at 1185k (including 1140-1181 completed by pb), a new prime found last week at n=1182083 :smile:

k=35 at 1720k (including 1550-1715 completed before with help from Beyond and Cruelty)

k=79 at 1060k

Releasing k=177 at 1280k

Taking k=139 from 800k

em99010pepe 2009-08-11 01:00

[quote=Cruelty;183403]Reserving the following k:[LIST][*]from n=1.7M: 51, 57, 61, 65, 87[/LIST][/quote]

From [URL=""]here[/URL] 51, 57, 65 and 87 are only done to 1M. Why aren't you starting the sieve from 1M?
Thanks in advance.

amphoria 2009-08-11 05:42

[QUOTE=em99010pepe;184891]From [URL=""]here[/URL] 51, 57, 65 and 87 are only done to 1M. Why aren't you starting the sieve from 1M?
Thanks in advance.[/QUOTE]

They have been fully tested to 1M. They have been sieved to 1.7M and partially tested already.

Cruelty 2009-08-11 14:13

[QUOTE=amphoria;184922]They have been fully tested to 1M. They have been sieved to 1.7M and partially tested already.[/QUOTE] Yep, that's what I was told :smile:

MooooMoo 2009-08-27 23:49

1 Attachment(s)
k=173 is complete to n=1017K, and k=263 is complete to n=941K. No primes were found for either k, and I'm releasing them. The results are attached below.

MooooMoo 2009-08-27 23:56

The sieve file for k=173 can be found here: [url][/url]
for those of you who're interested in it. It's only sieved to p=2.3T, but it goes all the way from n=1M to n=2M.

I got the k=263 file from VBCurtis and Cruelty, so talk to them if you want to test this k further.

It's been a great joy to contribute to this project for the past three years, and I wish everyone luck in their prime-finding efforts.

VBCurtis 2009-08-28 07:09

I'll finish 263 to at least 1M. I still have the sieve file.
I am wrapping up a major project that was using ~10 cores for the past 9 months, so I'll be making reasonably fast progress on the half-dozen Cruelty k's I have now including this one, at least compared with 2008-09.

Kosmaj 2009-08-29 00:08

k=21 at 1200k.

k=79 completed to 1120k and released.

The current status of all k<300 can be found [URL=""]here[/URL].

Cruelty 2009-08-31 16:44

Status report
k=25 tested till n=2.23M
k=43 sieving
k=59 tested till n=3.25M
k=101 tested till n=2.04M
k=151 tested till n=2.04M
k=233 tested till n=1.3M
k=283 tested till n=1.3M
k=299 tested till n=1.3M

I am still working on those.

VBCurtis 2009-09-01 01:19

It has been a few months since a report, mostly because I tested a 25k block of Adam's 6000-6200 sieve, which was something like 75000 candidates.

11 1.88M
13 1.80M (no change)
41 1.01M (gap to 1.05, complete 1.05-1.15M)
45 1.3M (just a few gaps to 1.75M, should be filled in ~60 days)
99 1.6M (more than half done to 2.0M, but with gaps)
109 1.0M (no change)
127 2.37M
131 888k
201 1.17M
211 895k
245 806k
269 900k (no change)
281 900k (no change)

I should have all but 245 done to 1M in 30-45 days.

kar_bon 2009-09-01 09:22

k=297 done to n=1.0M and releasing

em99010pepe 2009-09-08 21:36


How is the sieve going?

VBCurtis 2009-09-11 05:43

The sieve is running! At 2T, 8.1 million candidates in the file.
Cruelty is sieving at 2T, I'm working on 8-10T.
It's slow going- on a core2-2.2ghz, around 3 weeks per T on a single core.
Such a large sieve is very efficient- at 8T, I find a factor in less than 50 seconds.

To keep this thread less cluttered, I suggest anyone interested in sieving to PM cruelty and I for more details.

Cruelty 2009-09-30 08:22

Status report
k=25 tested till n=2.24M
k=43 tested till n=1.72M
k=59 tested till n=3.33M
k=101 tested till n=2.08M
k=151 tested till n=2.07M
k=233 tested till n=1.33M
k=283 tested till n=1.37M
k=299 tested till n=1.32M

I am still working on those.

kar_bon 2009-10-05 09:10

k=251 at n=1143000 and releasing

Beyond 2009-10-05 09:14

[QUOTE=kar_bon;191906]k=251 at n=1143000 and releasing[/QUOTE]

I'll pick it up from there, if there's no objections.

sjtjung 2009-10-06 14:46

It's been a while since my last update :P

k=31 has been tested up to 1570k

k=207 has been tested up to 1M


VBCurtis 2009-10-14 22:35

k's with updates:
41 1.16M (was 1.01)
127 2.41M (was 2.37)
131 1M (was 888k)
263 955k (was 941k)
269 1M (was 900k)
281 945k (was 900k)

211 and 245 are mostly done to 1M, but are spread over 4-6 machines each, so small gaps exist. They should be complete to 1M at my next update.

Cruelty 2009-10-18 08:46

k=299 tested till n=1.36M. I am releasing this k.

Beyond 2009-10-21 10:14

I'll take it up to at least 2M. (k=299)

Update: k=251 sieve is almost complete, testing should begin on Friday.

VBCurtis 2009-10-21 14:23

Beyond- please pm me an email to send the k=299 sieve to. We have it sieved to 2M.

Cruelty 2009-10-31 10:03

status report
k=25 tested till n=2.26M
k=43 tested till n=1.79M
k=59 tested till n=3.34M
k=101 tested till n=2.14M
k=151 tested till n=2.12M
k=233 tested till n=1.38M
k=283 tested till n=1.47M

I am still working on those.

Kosmaj 2009-11-03 00:10

k=7 at 2450k, including 2366-2429 completed by Peter
k=9 at 1414k, including 1350-1375, and 1400-1414 completed by AES
k=139 at 930k
k=161 at 1M, released
k=163 at 1M, released
k=195 at 950k
k=239 at 1200k

em99010pepe 2009-11-07 12:11


When are you going to update the k<300 page?

Thank you in advance,


Kosmaj 2009-11-08 13:32

The [URL=""]k<300 status page[/URL] is now up to date. Sorry for the delay.

Cruelty 2009-11-09 17:45

I'm reserving k=223 from n=2M.

Kosmaj 2009-11-18 02:05

Reserving k=181.

Larry stopped at 898k, and sent me his sieving file. I'll continue from there.

Kosmaj 2009-11-20 02:38

k=193 and k=277 completed to 1M and released

k=9 at 1415k, in progress

k=181 at 900k, in progress

Cruelty 2009-12-01 06:47

Status report
k=25 tested till n=2.28M
k=43 tested till n=1.86M
k=59 tested till n=3.34M
k=101 tested till n=2.19M
k=151 tested till n=2.16M
k=223 tested till n=2.04M
k=233 tested till n=1.42M
k=283 tested till n=1.55M

I am still working on those.

sjtjung 2009-12-05 00:18

31 has been tested up to 1.6M
207 is being sieved and still at 1M
221 is being tested for range 1M-1.1M


Kosmaj 2009-12-05 03:21

k=9 at 1520k, including ranges already completed by Peter and AES
k=139 at 1M
k=181 at 920k
k=195 at 980k

All in progress.

Kosmaj 2009-12-05 04:06

All k<180 are now tested at least up to n=1M.

And [URL=""]the status page[/URL] is updated with all recent reports.

em99010pepe 2009-12-05 07:48

[quote=Kosmaj;197852]All k<180 are now tested at least up to n=1M.

And [URL=""]the status page[/URL] is updated with all recent reports.[/quote]

You forgot that k=105 is done up to 1200k.

Kosmaj 2009-12-05 11:57

[QUOTE=em99010pepe;197884]You forgot that k=105 is done up to 1200k.[/QUOTE]

Corrected! Thanks for noticing.

em99010pepe 2009-12-05 17:06

Can you add a column with the Nash weight?

Can I assist you on taking k=181 and k=195 to 1M?

em99010pepe 2009-12-06 10:36

Can I assist you on taking k=181 and k=195 to 1M?[/quote]

Or anyone else...

Kosmaj 2009-12-07 03:42

I have k=195 up to 1M already loaded for tests, and can do it myself.

Regarding k=181 I can send you a 20k block, most likely it's going to be 960-980 if you agree.


em99010pepe 2009-12-07 07:37


Regarding k=181 I can send you a 20k block, most likely it's going to be 960-980 if you agree.


Sure. Please send it to me. Thank you.

Cruelty 2009-12-31 14:47

Status report
k=25 tested till n=2.29M
k=43 tested till n=1.9M
k=59 tested till n=3.35M
k=101 tested till n=2.22M
k=151 tested till n=2.18M
k=223 tested till n=2.1M
k=233 tested till n=1.45M
k=283 tested till n=1.61M

I am still working on those. Maybe 2010 will bring me more primes :wink:

Kosmaj 2010-01-03 07:38

[URL=""]k<300 status page[/URL] updated with the above report by Cruelty, and the status of following RPS single-K drives:

k=15 at 1908k
k=17 at 2.2M

VBCurtis 2010-01-12 08:37

A full update, because it has been a few months: last report in parens
k=11 1.94M (1.88M)
k=41 1.22M (1.16M)
k=45 1.30M (no change, running on a quad I haven't seen in 7 months)
k=99 1.60M (no change, recently assigned to a quad running part time)
k=127 2.50M (2.41M)
k=211 1.0M (895k)
k=221 should no longer be assigned to me- Steven has taken over its search.
k=245 950k (806k)
k=263 960k (955k)
k=269 1.05M (1M)
k=281 1.0M (945k)
k=13,109,131,201 no change.
I set a goal of all these to 1.0M by the end of 2009. 263 was very close on my now-stolen laptop, so I have to redo quite a bit of the last 50k. 245 is on a work machine and should be past 1M, but the owner won't be around for a few weeks so I can't check it. I hope to update both within 3 weeks to 1M.

Kosmaj 2010-01-17 06:16

k=7 at 2.5M
k=139 at 1020k, prime at n=1016619
k=181 at 1010k

All k<245 are now tested up to n=1M.

VBCurtis 2010-01-24 08:06

k=127 2.70M
k=245 1.0M
k=263 1015k
k=269 1.34M

This completes all of my k<300 reservations to 1M.

k=405 complete to 770k, still sieving at 46T.

Kosmaj 2010-01-31 14:32

Thanks Curtis.

And Gryphon informed me that he tested k=255 up to n=1M.

Therefore, all k<300 are now completely tested up to n=1M!

em99010pepe 2010-01-31 14:47


Therefore, all k<300 are now completely tested up to n=1M![/quote]

Congratulations to all contributors!

Cruelty 2010-01-31 15:08

Status report
k=25 tested till n=2.32M
k=43 tested till n=1.96M
k=59 tested till n=3.37M
k=101 tested till n=2.27M
k=151 tested till n=2.22M
k=223 tested till n=2.17M
k=233 tested till n=1.5M
k=283 tested till n=1.68M

Kosmaj 2010-02-11 03:41

k=9 at 1530k
k=21 at 1230k
k=91 and k=97 at 1120k
k=95 at 1050k
k=181 at 1020k
k=195 at 1M (more than a month ago, but forgot to report)

Releasing k=91 and k=195, further testing all others.

Kosmaj 2010-02-11 04:54

Update on k<300 minmax primes:

k largest prime
233 179992
13 233207
191 240802
249 251036[/CODE]

All are tested up to n=1M or more.
The largest primes of all other Ks have 300k digits or more.

k=283 was removed from the top of the list by Cruelty.
Its largest prime was at n=149351, but now it's at n=1702599.

The previous status can be found [URL=""]here[/URL].

Cruelty 2010-02-13 09:10

I'm releasing k=283 @ n=1.715M :smile:

em99010pepe 2010-02-13 10:11

[quote=Cruelty;205546]I'm releasing k=283 @ n=1.715M :smile:[/quote]

How far and how deep did you sieve k=283?

Cruelty 2010-02-13 12:15

[QUOTE=em99010pepe;205553]How far and how deep did you sieve k=283?[/QUOTE]n=2M, p>60T I don't recall exactly how deep...

em99010pepe 2010-02-16 12:08

Just to let you guys know that this [URL=""]page[/URL] is out of date.

Cruelty 2010-02-28 17:47

Status report
k=25 tested till n=2.33M
k=43 tested till n=2.01M
k=59 tested till n=3.38M
k=101 tested till n=2.30M
k=151 tested till n=2.25M
k=223 tested till n=2.23M
k=233 tested till n=1.54M

unconnected 2010-03-14 15:32

I would like to reserve two low-weight k's: k=29 and k=253. As I can see, they both are free, please confirm this.

Kosmaj 2010-03-14 15:56

Yes, they are both available:
k=29 from n=2M
k=253 from n=1750k

Happy hunting!

VBCurtis 2010-03-21 09:02

k=11 2.1M
k=13 2.12M
k=41 1.35M
k=109 1.1M
k=127 3.11M
k=201 1.2M
k=263 1.1M
k=269 1.5M

I intend to complete my files for 41 and 269 and release them this summer. I have almost as many k's as cores, not a good ratio.

Cruelty 2010-03-31 16:32

Status report
k=25 tested till n=2.34M
k=43 tested till n=2.07M
k=59 tested till n=3.4M
k=101 tested till n=2.35M
k=151 tested till n=2.29M
k=223 tested till n=2.3M
k=233 tested till n=1.58M

Kosmaj 2010-04-11 00:48

k=7 at n=2510k
k=9 at 1540k
k=21 at 1290k
k=63 at 1090k
k=95 at 1100k
k=97 at 1150k
k=181 at 1050k

The [URL=""]k<300 status page[/URL] updated with all reported ranges and latest primes, including the mega-digit k=59 prime by Cruelty.

Cruelty 2010-04-11 09:43

I'm releasing k=59 @ n=3.41M.

Kosmaj 2010-04-13 10:25

k=75 is now at n=1150k, including 1090-1130 completed by SlashDude a few years ago.

k=63 is now at n=1100k.

Cruelty 2010-04-30 18:26

Status report
k=25 tested till n=2.36M
k=43 tested till n=2.12M
k=101 tested till n=2.39M
k=151 tested till n=2.32M
k=223 tested till n=2.36M
k=233 tested till n=1.61M

amphoria 2010-04-30 22:15

k=67 tested to 2.18M
k=227 tested to 1.15M

Beyond 2010-04-30 23:46

1 Attachment(s)
k=251 tested to 2.0m -- sieving to 4m to start soon
k=47 & 53 sieving to 3m continues

251 results attached

Lennart 2010-05-02 03:43

Is it OK to take k=297 ?

If it is I reserve that k.


Kosmaj 2010-05-02 06:11

Yes, k=297 is available from n=1M, ..., and it's now yours :smile:

Lennart 2010-05-02 06:16

[quote=Kosmaj;213747]Yes, k=297 is available from n=1M, ..., and it's now yours :smile:[/quote]

Thanks :)


Kosmaj 2010-05-04 02:55

k=7 at 2530k
k=21 at 1320k
k=63 at 1130k (including 1120-1130 I tested 2 years ago)
k=239 at 1290k

The [URL=""]k<300 stats page[/URL] updated with everything up to here, including PrimeGrid's k=3 prime at 6090k.

Lennart 2010-05-09 15:47

1 Attachment(s)
Releasing k297 at 1.1M

No primes.

attached result. I have a sieve file 1M-3M sieved to 20T

PM me and I send you the file.


Kosmaj 2010-05-10 02:23

Thanks for the results, although we hoped you would stay with us longer :smile:

Can you kindly [EMAIL=""]mail me [/EMAIL]the sieve file.

Lennart 2010-05-10 03:37

[quote=Kosmaj;214489]Thanks for the results, although we hoped you would stay with us longer :smile:

Can you kindly [EMAIL=""]mail me [/EMAIL]the sieve file.
Mail sent.

I will come back and do more :smile:


Cruelty 2010-05-31 16:30

Status report
k=25 tested till n=2.37M
k=43 tested till n=2.17M
k=101 tested till n=2.43M
k=151 tested till n=2.35M
k=223 tested till n=2.42M
k=233 tested till n=1.64M

Kosmaj 2010-06-05 15:44

The [URL=""]k<300 stats page[/URL] is now updated with latest primes.

My progress:
k=7 at 2550k
k=9 at 1570k
k=239 at 1330k

amphoria 2010-06-30 17:57

k=67 at 2.27M
k=227 at 1.25M

Cruelty 2010-06-30 18:29

Status report
k=25 tested till n=2.39M
k=43 tested till n=2.22M
k=101 tested till n=2.46M
k=151 tested till n=2.39M
k=223 tested till n=2.48M
k=233 tested till n=1.67M

Kosmaj 2010-07-18 01:44

Progress Report
k=7 at 2580k
k=9 at 1610k
k=21 at 1400k
k=139 at 1100k
k=181 at 1100k

pb386 reserved k=19.
I reserved k=37 in the 1450-1500k range, k=37 is available from 1500k.

The [URL=""]k<300 status page[/URL] has been updated.

MooMoo2 2010-08-01 02:52

Reserving k=161 (from n=1M)

MooMoo2 2010-08-01 06:27

[QUOTE=MooMoo2;223510]Reserving k=161 (from n=1M)[/QUOTE]
I can't edit that post, but I'd like to add that I have a 6 core machine that's on 24 hours a day, and most of those cores will be used on that k if my reservation is accepted. I'll also post updates here every month or two.

Looking forward to hearing from you soon, since I'm eager to start sieving :smile:

Kosmaj 2010-08-01 06:34

Your reservation is accepted, and we wish you many primes!

I'll check my old files to see whether I have any presieved file for k=161 and will let you know if I do.

amphoria 2010-08-01 09:24

k=67 at n=2.3M

k=227 at n=1.3M

Cruelty 2010-08-01 17:06

Status report
k=25 tested till n=2.4M
k=43 tested till n=2.27M
k=101 tested till n=2.5M
k=151 tested till n=2.42M
k=223 tested till n=2.53M
[B]k=233 tested till n=1.71M --> I am releasing this k[/B]

VBCurtis 2010-08-09 21:03

k=41 tested to 1652k by me. Peter reported 1652 to 1702 complete in another thread, so this is complete to 1.7M. I am releasing this k.


MooMoo2 2010-08-31 07:32

1 Attachment(s)
k=161 is complete to n=1.06M with no primes found. I've attached the results from n=1M to n=1060k.

Cruelty 2010-09-01 22:22

Status report
k=25 tested till n=2.42M
k=43 tested till n=2.31M
k=101 tested till n=2.55M
k=151 tested till n=2.45M
k=223 tested till n=2.58M

Kosmaj 2010-09-05 12:47

k=7 at 2.6M
k=9 at 1814k (all gaps up to here filled)
k=21 at 1470k (ditto)
k=37 at 1510k
k=97 at 1230k

[URL=""]k<300 status page[/URL] updated with this and other results reported above.

pb386 2010-09-06 12:33

k=19 at 1.5M

1 additional prime found (19*2^1325245-1 is prime!)

All times are UTC. The time now is 11:33.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.