%I A109132
%S A109132 0,1,2,3,11,77
%N A109132 Numbers n such that n! + 1 is a Chen prime. n! + 1 is then called a factorial 
               Chen prime.
%C A109132 Conjecture: 77! + 1 is the largest factorial Chen prime.
%C A109132 For n>2, n is in the sequence iff both numbers n!/3+1 and n!+1 are primes. 
               - Farideh Firoozbakht (mymontain(AT)yahoo.com), Mar 24 2006
%Y A109132 Cf. A002981, A109611.
%Y A109132 Sequence in context: A065597 A001052 A155187 this_sequence A008510 A042165 
               A089921
%Y A109132 Adjacent sequences: A109129 A109130 A109131 this_sequence A109133 A109134 
               A109135
%K A109132 hard,more,nonn
%O A109132 1,3
%A A109132 Jason Earls (zevi_35711(AT)yahoo.com), Aug 17 2005