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Forum: Prime Cullen Prime 2006-12-02, 05:04
Replies: 22
Views: 16,341
Posted By maxal
Correction: r = ((z-k) * p + u[k] * (p-1)) mod...

Correction: r = ((z-k) * p + u[k] * (p-1)) mod (p*z)
Forum: Prime Cullen Prime 2006-12-01, 20:48
Replies: 22
Views: 16,341
Posted By maxal
There is a faster way to sieve out numbers of the...

There is a faster way to sieve out numbers of the form q*2^q+1 that are divisible by a given prime p>=3.

Suppose that q*2^q+1 is divisible by p. Then q*2^q = -1 (mod p) or alternatively q = -...
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