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2007-01-11, 11:18   #8
ValerieVonck

Mar 2004
Belgium

34716 Posts

Quote:
 Originally Posted by fatphil Containing <<< 22*22^511+1 is not prime. 22*22^2047+1 is not prime. 22*22^3583+1 is not prime. 22*22^6655+1 is not prime. >>> Are you sure you know what you're doing? Those are 22^n+1, which can only ever be prime if n=2^m for some n, namely generalised Fermat numbers.
Apperantely not then... Like I said I used NewPGen to sieve the file:
Code:
k*b^n-1 with k fixed
k = 22
b = 22
n from 2 to 1.000.000
Then I fired up LLR.exe (3.7.1)