Post small primes and tell us about your progress here

[gd_barnes]

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.

k=2145:
test limit: 525K
no primes this month

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

* - confirmed prime(s) previously found by others

No top-5000 primes this month.


For a more complete list, see my new Riesel primes found and testing ranges web page here.

The following ranges searched are exceptions to the above that include ranges that have been previously searched by others:

k=111546435: -377.5K (all ranges tested)
k=115029915: -385K (all ranges tested)


Gary

[AES]

3015015*2^n-1 is prime for

n = 222978, 230010, 237426, 242126, 276613, 295918, 313325, 320385, 330143

[Templus]

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

[kar_bon]

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

[Templus]

Hello Karsten,

You are right, for some reason I must have missed the primes for n=4 and n=9...

[grobie]

166288 is prime
178300 is prime

testing completed to n=184180

[VBCurtis]

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

[VBCurtis]

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

[sjtjung]

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

[gd_barnes]

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

I am unreserving this k.

[gd_barnes]

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.

k=2145: complete to n=600K and unreserved; no primes this month

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

* - 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 here.

The following ranges searched are exceptions to the above that include ranges that have been previously searched by others:

k=111546435: -389K (all ranges tested)
k=115029915: -389K (all ranges tested)


Gary