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%I #3 Mar 30 2012 18:50:43
%S 1,2,3,4,6,7,8,9,10,12,14,16,18,19,20,21,22,23,24,25,26,27,28,29,30,
%T 32,33,34,35,36,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,56,
%U 57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79
%N In binary representation: numbers occurring at least once in their factorial.
%C A093684(a(n)) > 0, complement of A093685.
%e 6!=1*2*3*4*5*6=720 -> '1011010000' where '110'=6 is contained:
%e '..110.....', therefore 6 is a term.
%Y Cf. A036603, A007088, A000142.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Apr 10 2004
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