OFFSET
1,3
COMMENTS
Conjecture: 77! + 1 is the largest factorial Chen prime.
For n>2, n is in the sequence iff both numbers n!/3+1 and n!+1 are primes. - Farideh Firoozbakht, Mar 24 2006
CROSSREFS
KEYWORD
hard,more,nonn
AUTHOR
Jason Earls, Aug 17 2005
STATUS
approved