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Forum: Conjectures 'R Us 2017-04-28, 19:58
Replies: 15
Views: 16,161
Posted By Batalov
What other digits could they end with (if they...

What other digits could they end with (if they are factors of 4*20^n+1 and n = 4k+2 *)?

It is a simple question, really.
Just consider all possible values p mod 20, and you will find that only 1...
Forum: Conjectures 'R Us 2017-04-28, 18:39
Replies: 15
Views: 16,161
Posted By Batalov
Factors should be accompanied with what they...

Factors should be accompanied with what they divide!
Forum: Conjectures 'R Us 2017-04-28, 14:34
Replies: 15
Views: 16,161
Posted By Batalov
Can you show the 14- and 15-digit factors? ...

Can you show the 14- and 15-digit factors?
There is an easy explanation for them, I think.
Forum: Conjectures 'R Us 2017-04-26, 19:16
Replies: 15
Views: 16,161
Posted By Batalov
Exclamation P-1 factoring has a benefit for moderately sized...

P-1 factoring has a benefit for moderately sized Mersennes (demonstratively) and similarly for GFNs, and P.I.E.S. All for the same reason - their factors are of shape 2*k*S+1 where S is known and...
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