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%I #6 Mar 02 2013 23:59:29
%S 3,5,17,257,641,1217,14593,167809,671233,1314497,180449537,424050817
%N Smallest prime number, not already in sequence, such that the product M of it and all prior numbers in sequence satisfies 2^(M+1) = 1 (mod M).
%e a(3)=17 because n=3*5*17=255 and 2^256 = 1 (mod 255)
%K nonn
%O 1,1
%A Joe K. Crump (joecr(AT)carolina.rr.com), Jan 09 2001
%E Offset corrected by _Charles R Greathouse IV_, Mar 02 2013
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