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Forum: No Prime Left Behind 2013-09-19, 01:49
Replies: 6
Views: 8,309
Posted By Batalov
These are not hard problems. You put [Worker...

These are not hard problems. You put
[Worker #1]
PRP=1,10,33554432,1
in worktodo.txt and
ThreadsPerTest=6 (or 8)
in local.txt, and you will be done in no time on a computer with ECC memory....
Forum: No Prime Left Behind 2013-09-18, 22:25
Replies: 6
Views: 8,309
Posted By Batalov
I actually have, -- as well as all composite...

I actually have, -- as well as all composite cofactors in the same range (for all five bases up to n<=25 iirc). I've done that back in 2008, 2009. (Note that you have to use base other than 3 for...
Forum: No Prime Left Behind 2013-09-17, 18:48
Replies: 6
Views: 8,309
Posted By Batalov
Only Generalized Fermat numbers (in base 10 in...

Only Generalized Fermat numbers (in base 10 in this case), can be prime:
10N+1, where N=2n.

And even these are very rarely prime. It is conjectured that there's only a finite number of them.
...
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