mersenneforum.org Riesel Primes k*2^n-1, k<300 [Was "k=1"]
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 2005-02-28, 13:53 #309 Templus     Jun 2004 10610 Posts k=65 Hi, after a period of absence on this project, I'm catching up k=65 from n=210k until....? Best Regards, Templus/Ingmar (L75)
 2005-03-01, 06:35 #310 lsoule     Nov 2004 California 23×3×71 Posts One more prime for k=231: 231*2^465391-1 (140100 digits)
 2005-03-07, 10:56 #311 Thomas11     Feb 2003 1,907 Posts status for k=75 k=75 has been tested up to n=500000 now, where I'm stopping. The range n=250000-500000 contains the following primes: 75 306789 75 424392 75 434323 -- Thomas11 (L8)
 2005-03-07, 23:44 #312 lsoule     Nov 2004 California 23×3×71 Posts 231 498961 231 has been completed up to n=500k and continuing...
 2005-03-11, 11:25 #313 jocelynl   Sep 2002 2×131 Posts 251 359790 This is my first 100,000 digits Joss L15
 2005-03-11, 23:51 #314 lsoule     Nov 2004 California 32508 Posts Congrats jocelynl. 231 has also been producing some big ones recently: 231 535713
 2005-03-14, 21:13 #315 Templus     Jun 2004 2×53 Posts k=65 update k=65 has been sieved until 123.0 billion (and still sieving). It has been tested until n=267k. No primes found yet. I am continuing on this k.
 2005-03-15, 21:33 #316 jocelynl   Sep 2002 2·131 Posts 269 264932 is prime! I'm taking this one to 400k Joss
 2005-03-22, 15:35 #317 Kosmaj     Nov 2003 70468 Posts Finally I hit a big one: 21*2^999599-1 is prime! 310911 digits currently the 80th largest of all times After testing k=21 from 500k to 950k in increasing order I decided to try the top range from 1M to 995k in reversed order and the prime was right there on line 7 of the file! Achieved limits of this and other k's (no other primes found): k=7: 1.180 M k=21: 950k k=55: 430k k=77: 700k k=79: 520k stopped k=89: 500k Continuing k=55 and k=89 to 520k, k=21 to 1M, k=7 and k=77 until further notice
 2005-03-27, 21:27 #318 Templus     Jun 2004 2·53 Posts k=65 update k=65 has been sieved until 155G and tested until n=305k, no new primes found so far! There are 33800 tests until n=1M left.
 2005-03-29, 16:12 #319 Kosmaj     Nov 2003 2×1,811 Posts k=89 completed to n=520k and stopped/released. No new primes. Now I'd like to reserve k=95 and k=165 from 210k.

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