OFFSET
1,1
COMMENTS
Comment from Giovanni Resta, Nov 15 2006: For all the numbers listed, gcd(n!-1,2^n+1) = 2n+1. Is this always true? Reply from Max Alekseyev, Nov 16 2006: This is plausible and true for n up to 45000.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Mar 02 2002
STATUS
approved