mersenneforum.org Report top-5000 primes here
 Register FAQ Search Today's Posts Mark Forums Read

2009-02-06, 01:53   #67
gd_barnes

May 2007
Kansas; USA

33×17×23 Posts

Quote:
 Originally Posted by mdettweiler Another one for Sierp. base 33: 1818*33^79815+1 is prime! Only one k remaining for Sierp. base 33 (at n=100K and unreserved as previously reported in the bases > 32 status thread)--and this prime makes the top-5000 to boot!

Nice one!

This is amazing! We have yet ANOTHER Sierpinski base with 1 k remaining at n=100K. These final k's on the Sierp side are truly stubborn.

Gary

 2009-02-09, 12:28 #68 kar_bon     Mar 2006 Germany 1011011100002 Posts Riesel Base 35 here is my first base-35 prime. after 2 'small' generalized woodalls the only one in the TOP5000 currently in the big list! 75570*35^74111-1 is prime! i checked this k alone, because it was the one with the most candidates left to n=100k!
 2009-03-16, 20:00 #69 gd_barnes     May 2007 Kansas; USA 244758 Posts My first non-power-of-2 top-5000 prime: 2377*28^104621+1 is prime 4 k's to go on Sierp base 28 Riesel and Sierp base 28 are both now at n=105K. Gary
 2009-04-18, 14:55 #70 Siemelink     Jan 2006 Hungary 22×67 Posts Riesel base 19 Primality testing 28034*19^92302-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 5, base 5+sqrt(5) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 28034*19^92302-1 is prime! (10748.9939s+0.0356s) I grabbed a bunch of k's, sieved them for a while and then continued only with the one that had the most candidates. I've done 57% of the range when I had found the prime. Happy me, Willem.
 2009-04-18, 20:55 #71 gd_barnes     May 2007 Kansas; USA 33×17×23 Posts Excellent prime Willem!
2009-04-19, 00:30   #72
rogue

"Mark"
Apr 2003
Between here and the

647110 Posts

Quote:
 Originally Posted by Siemelink Primality testing 28034*19^92302-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 5, base 5+sqrt(5) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 28034*19^92302-1 is prime! (10748.9939s+0.0356s) I grabbed a bunch of k's, sieved them for a while and then continued only with the one that had the most candidates. I've done 57% of the range when I had found the prime. Happy me, Willem.
I'm curious to know if LLR is faster than phrot for this base. Did you compare both programs?

2009-04-19, 22:01   #73

Jan 2006
Hungary

22×67 Posts

Quote:
 Originally Posted by rogue I'm curious to know if LLR is faster than phrot for this base. Did you compare both programs?
Nope, the last time I thought of Phrot was when you were busy tweaking it.

Cheers, Willem.

2009-04-20, 00:26   #74
rogue

"Mark"
Apr 2003
Between here and the

647110 Posts

Quote:
 Originally Posted by Siemelink Nope, the last time I thought of Phrot was when you were busy tweaking it. Cheers, Willem.
It's pretty solid now. I am only aware of an issue with GFNs (b^(2^m)+1), but since genefer is primarily used for GFNs, I'm not too concerned about fixing it.

If you do decide to putter around with it, I'd be curious to see some comparison timings.

Last fiddled with by rogue on 2009-04-20 at 00:27

 2009-05-27, 18:04 #75 gd_barnes     May 2007 Kansas; USA 1055710 Posts Here's a nice one: 3104*22^161188-1 is prime I FINALLY got another one on my large base 22/27/28 testing. Only 1 k to go on Riesel base 22; continuing it up to n=200K. What else is new? ...many bases with 1 k remaining, especially on the Sierp side. Gary
 2009-08-25, 20:07 #76 Siemelink     Jan 2006 Hungary 22×67 Posts Primality testing 8681*30^140627-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 11, base 1+sqrt(11) Calling Brillhart-Lehmer-Selfridge with factored part 47.32% 8681*30^140627-1 is prime! (15798.4912s+0.0541s) Tralala, Willem.
2009-08-25, 20:19   #77
kar_bon

Mar 2006
Germany

24·3·61 Posts

Quote:
 Originally Posted by Siemelink 8681*30^140627-1 is prime!
There're only three base-30 primes in the Top5000 list, 9 years old and all Gen.Woodall's.
This is 10 times greater than those. Nice find!

 Similar Threads Thread Thread Starter Forum Replies Last Post gd_barnes No Prime Left Behind 1532 2021-12-04 02:36 gd_barnes No Prime Left Behind 688 2020-04-24 07:31 Batalov Conjectures 'R Us 10 2013-03-29 01:29 masser Lounge 9 2008-08-27 12:31 jasong jasong 1 2007-06-09 22:51

All times are UTC. The time now is 07:05.

Wed Dec 8 07:05:37 UTC 2021 up 138 days, 1:34, 1 user, load averages: 1.30, 1.29, 1.28