mersenneforum.org Riesel Primes k*2^n-1, k<300 [Was "k=1"]
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 2006-03-04, 14:58 #386 Kosmaj     Nov 2003 70468 Posts k=277 I'd like to reserve k=277. I'll sieve from n=100k to fill the gaps on Keller's list. There are only two k<300 without 10,000+ digit primes and one of them is k=277. The largest known prime is 277*2^17357-1 (5228 digits). The other one is k=253, n_max=27623, checked by Joss to 1166k.
 2006-03-04, 19:07 #387 Flatlander I quite division it     "Chris" Feb 2005 England 31×67 Posts 125*2^418034-1 is prime. I hope.
2006-03-04, 19:59   #388
Flatlander
I quite division it

"Chris"
Feb 2005
England

31·67 Posts

Quote:
 Originally Posted by Flatlander 125*2^418034-1 is prime. I hope.
Yes, it is.

Also reserving k=135 from 210,000 please.

 2006-03-04, 22:04 #389 Templus     Jun 2004 2·53 Posts finally! Finally, a new prime for me! 199*2^263051-1 is prime!
 2006-03-05, 10:38 #390 Templus     Jun 2004 2·53 Posts And suddenly , out of nowhere: 93*2^362268-1 is prime! 109056 digits!
 2006-03-05, 14:31 #391 grobie     Sep 2005 Raleigh, North Carolina 33710 Posts nice one
 2006-03-05, 18:48 #392 Kosmaj     Nov 2003 E2616 Posts Templus, congrats on your first prime with more than 100,000 digits The status page has been updated with new primes, and new reservations. I also cancelled reservations by Joss and Jeffrey since I heard nothing from them in more than a year (they are listed at the bottom of the page). I also cancelled all reservations by "Prime Search" project in the k=250-300 range since according to their home page nobody is working on them beyond 260k (with exception of k=253 which they have reserved to 420k, but Joss already checked it to 1166k).
 2006-03-05, 18:54 #393 Kosmaj     Nov 2003 1110001001102 Posts To Keller and Chaos: You reserved several k's as follows: Keller: 99, 237, 241 Chaos: 81, 127 but I haven't heard from you in a long while. Are you still working on these numbers? Please note that if you don't respond by March 31 (2006) I'll cancel your reservations. Thanks.
 2006-03-05, 19:07 #394 Kosmaj     Nov 2003 2×1,811 Posts Keller promptly replied to my PM and informed me that he would like to release all his reserved k's. Therefore k=99, 237 and 241 are now available for tests. I'll mark them free in the next update of the status page.
 2006-03-06, 00:18 #395 grobie     Sep 2005 Raleigh, North Carolina 5218 Posts k=139 k=139 tested to 400k complete with 2 primes already reported. Will continue this k when I complete re-test.
 2006-03-06, 17:09 #396 lsoule     Nov 2004 California 23·3·71 Posts Just a status update k=69 tested up to 640k k=195 tested up to 400k k=223 tested up to 770k k=231 tested up to 790k I'm still running these 4.

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