mersenneforum.org  

Go Back   mersenneforum.org > Prime Search Projects > Conjectures 'R Us

Reply
 
Thread Tools
Old 2009-02-06, 01:53   #67
gd_barnes
 
gd_barnes's Avatar
 
May 2007
Kansas; USA

33×17×23 Posts
Default

Quote:
Originally Posted by mdettweiler View Post
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
gd_barnes is offline   Reply With Quote
Old 2009-02-09, 12:28   #68
kar_bon
 
kar_bon's Avatar
 
Mar 2006
Germany

1011011100002 Posts
Default 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!
kar_bon is offline   Reply With Quote
Old 2009-03-16, 20:00   #69
gd_barnes
 
gd_barnes's Avatar
 
May 2007
Kansas; USA

244758 Posts
Default

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
gd_barnes is offline   Reply With Quote
Old 2009-04-18, 14:55   #70
Siemelink
 
Siemelink's Avatar
 
Jan 2006
Hungary

22×67 Posts
Default 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.
Siemelink is offline   Reply With Quote
Old 2009-04-18, 20:55   #71
gd_barnes
 
gd_barnes's Avatar
 
May 2007
Kansas; USA

33×17×23 Posts
Default

Excellent prime Willem!
gd_barnes is offline   Reply With Quote
Old 2009-04-19, 00:30   #72
rogue
 
rogue's Avatar
 
"Mark"
Apr 2003
Between here and the

647110 Posts
Default

Quote:
Originally Posted by Siemelink View Post
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?
rogue is offline   Reply With Quote
Old 2009-04-19, 22:01   #73
Siemelink
 
Siemelink's Avatar
 
Jan 2006
Hungary

22×67 Posts
Default

Quote:
Originally Posted by rogue View Post
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.
Siemelink is offline   Reply With Quote
Old 2009-04-20, 00:26   #74
rogue
 
rogue's Avatar
 
"Mark"
Apr 2003
Between here and the

647110 Posts
Default

Quote:
Originally Posted by Siemelink View Post
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
rogue is offline   Reply With Quote
Old 2009-05-27, 18:04   #75
gd_barnes
 
gd_barnes's Avatar
 
May 2007
Kansas; USA

1055710 Posts
Default

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
gd_barnes is offline   Reply With Quote
Old 2009-08-25, 20:07   #76
Siemelink
 
Siemelink's Avatar
 
Jan 2006
Hungary

22×67 Posts
Default

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.
Siemelink is offline   Reply With Quote
Old 2009-08-25, 20:19   #77
kar_bon
 
kar_bon's Avatar
 
Mar 2006
Germany

24·3·61 Posts
Default

Quote:
Originally Posted by Siemelink View Post
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!
kar_bon is offline   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Report top-5000 primes for all k<=1001 gd_barnes No Prime Left Behind 1532 2021-12-04 02:36
Report top-5000 primes for k=1003-3000 gd_barnes No Prime Left Behind 688 2020-04-24 07:31
All top 5000 primes will have the same number of digits in 2014 ;-) Batalov Conjectures 'R Us 10 2013-03-29 01:29
Twenty Oldest Primes on Top 5000 List masser Lounge 9 2008-08-27 12:31
get all the 5000 biggest primes above 100K digits 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

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.