OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from G. C. Greubel)
MAPLE
select(n->gcd(factorial(n)+1, 2^n+1)>1, [$1..1470]); # Muniru A Asiru, Oct 16 2018
MATHEMATICA
Select[Range[2500], GCD[#! + 1, 2^# + 1] > 1 &] (* G. C. Greubel, Oct 15 2018 *)
PROG
(PARI) isok(n) = gcd(n!+1, 2^n+1) > 1; \\ Michel Marcus, Oct 16 2018
(GAP) Filtered([1..1470], n->Gcd(Factorial(n)+1, 2^n+1)>1); # Muniru A Asiru, Oct 16 2018
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Mar 10 2002
STATUS
approved