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%I #7 Dec 15 2017 17:36:52
%S 0,1,2,3,11,77
%N Numbers n such that n! + 1 is a Chen prime. n! + 1 is then called a factorial Chen prime.
%C Conjecture: 77! + 1 is the largest factorial Chen prime.
%C For n>2, n is in the sequence iff both numbers n!/3+1 and n!+1 are primes. - _Farideh Firoozbakht_, Mar 24 2006
%Y Cf. A002981, A109611.
%K hard,more,nonn
%O 1,3
%A _Jason Earls_, Aug 17 2005
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