OFFSET
1,1
COMMENTS
This subsequence of A068483 lists the rare exceptions for which gcd( N!, 2^N-1 ) <> 2N+1. Is it finite? Are all elements multiples of 5?
PROG
(PARI) for(n=1, 10^5, if((g=gcd(n!-1, 2^n-1)-1) & g!=2*n, print(n", ")))
CROSSREFS
KEYWORD
nonn,bref
AUTHOR
M. F. Hasler, Oct 28 2007
STATUS
approved