Dec. month end status
 

Here is my status for Dec. month-end for k's > 300 for record here. The primes shown are only those found since the Nov. month end status.

[quote]
[SIZE=2]k=2145:[/SIZE]
[SIZE=2]test limit: 525K[/SIZE]
no primes this month

[SIZE=2]k=19437, 102765, 3545685, 111546435, 115029915, 120023475, 290499495, 686701125, 775784295, 968911515, 1019370495, and 3428677395:[/SIZE]
[SIZE=2]test ranges: 0-278.2K and 328K-377.5K[/SIZE]
[SIZE=2]primes k / n(s):[/SIZE]
[SIZE=2]19437: none[/SIZE]
102765: none
[SIZE=2]3545685: 269737, 271428[/SIZE]
111546435: none
[SIZE=2]115029915: 269264*, 272429*[/SIZE]
120023475: none
[SIZE=2]290499495: 270189[/SIZE]
686701125: none
[SIZE=2]775784295: 274938[/SIZE]
[SIZE=2]968911515: 274697[/SIZE]
[SIZE=2]1019370495: 267809[/SIZE]
3428677395: 272013
[/quote]

* - confirmed prime(s) previously found by others

No top-5000 primes this month. :sad:


For a more complete list, see my new Riesel primes found and testing ranges web page [URL="http://gbarnes017.googlepages.com/Rieselprimes-ranges.htm"]here[/URL].

[SIZE=2]The following ranges searched are exceptions to the above that include ranges that have been previously searched by others:[/SIZE]

[SIZE=2]k=111546435: -377.5K (all ranges tested)[/SIZE]
[SIZE=2]k=115029915: -385K (all ranges tested)[/SIZE]


Gary

[FONT=Verdana][SIZE=2]3015015*2^n-1 is prime for

[/SIZE][/FONT][FONT=Verdana][SIZE=2]n = 222978, 230010, 237426, 242126, 276613, 295918, 313325, 320385, 330143[/SIZE][/FONT]

report on k=25935
 

k*2^n-1 for k=25935 has been sieved until 2.5T with 93000 tests left

I doublechecked all primes reported by phatfil until n=220k. Testing now completed until n=235k, and the 97th prime for this k is found:

25935*2^224175-1

please check
 

hi templus,
please check 'your' 97th prime with this from the summary:
1, 3, 4, 9, 10, 11, 12, 16, 19, 21, 23, 25, 29, 32, 33, 35, 44, 48, 64, 80, 82, 99, 100, 101, 128, 132, 141, 155, 170, 201, 213, 339, 570, 573, 623, 698, 721, 811, 826, 964, 1120, 1173, 1185, 1225, 1324, 1329, 1392, 1775, 2056, 2576, 2631, 3045, 3488, 3609, 3803, 4653, 4902, 5064, 5210, 5931, 6013, 6978, 7429, 8163, 8316, 9460, 11476, 12448, 13205, 16282, 19583, 22209, 26443, 28532, 29326, 32689, 34226, 42832, 44325, 46144, 47396, 54956, 67599, 69182, 69625, 75563, 81684, 83898, 84676, 91943, 92016, 101560, 117344, 121855, 139225, 152803, 173518, 219995, 224175(=99th prime!!!).
(while 15k.org is down)
thanks karsten

Hello Karsten,

You are right, for some reason I must have missed the primes for n=4 and n=9...:no:

Update for k=55951335
 

166288 is prime
178300 is prime

testing completed to n=184180

2175 274393 and
2055 277335 are prime.
My 2000's reservations are complete to 280k. (2055, 2085, 2115, 2175)
-Curtis

2175 301200 is prime. My 2000's (4 of them) are complete to 300k now.
-Curtis

2085 290460 is prime...(part of curtis' 2000's) found it last month, and forgot to report it.

k=2145 is now complete to n=600K. All primes previously reported.

I am unreserving this k.

Jan. month end status
 

Here is my status for Jan. month-end for k's > 300 for record here. The primes shown are only those found since the Dec. month end status.

[SIZE=2]k=2145: complete to n=600K and unreserved; no primes this month[/SIZE]

[quote]
[SIZE=2]k=19437, 102765, 3545685, 111546435, 115029915, 120023475, 290499495, 686701125, 775784295, 968911515, 1019370495, and 3428677395:[/SIZE]
[SIZE=2]test ranges: 0-290K and 328K-389K[/SIZE]
[SIZE=2]primes k / n(s):[/SIZE]
[SIZE=2]19437: none[/SIZE]
102765: 387776 (new prime previously reported)
[SIZE=2]3545685: 378703 (new prime previously reported)[/SIZE]
111546435: 289259*
[SIZE=2]115029915: 288710*[/SIZE]
120023475: 381138 (new prime previously reported)
[SIZE=2]290499495: none[/SIZE]
686701125: none
[SIZE=2]775784295: none[/SIZE]
[SIZE=2]968911515: none[/SIZE]
[SIZE=2]1019370495: none[/SIZE]
3428677395: none
[/quote]

* - confirmed prime(s) previously found by others

A strangely dormant month for k < 333.3K!

For a more complete list, see the Riesel primes found and testing ranges web page [URL="http://gbarnes017.googlepages.com/Rieselprimes-ranges.htm"]here[/URL].

[SIZE=2]The following ranges searched are exceptions to the above that include ranges that have been previously searched by others:[/SIZE]

[SIZE=2]k=111546435: -389K (all ranges tested)[/SIZE]
[SIZE=2]k=115029915: -389K (all ranges tested)[/SIZE]


Gary