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Forum: No Prime Left Behind 2011-09-20, 22:00
Replies: 12
Views: 10,489
Posted By kar_bon
k*2^n-1 and k*2^n+1 (k>1) both primes (so twins)...

k*2^n-1 and k*2^n+1 (k>1) both primes (so twins) -> k == 0 mod 3.
Forum: No Prime Left Behind 2011-09-20, 07:51
Replies: 12
Views: 10,489
Posted By kar_bon
Try pfgw with option "-go" or...

Try pfgw with option "-go" or "-gxo".
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