This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A103677 #15 Nov 16 2017 15:50:17 %S A103677 0,1,2,3,4,6,7,8,9,11,13,14,15,16,17,18,19,20,21,24,26,28,30,31,32,36, %T A103677 46,53,58,65 %N A103677 Numbers m such that in binary representation m! doesn't contain 5!. %C A103677 Conjecture: there are no further terms; %C A103677 complement of A103676: A103673(a(n))=0, A103673(A103676(n))=1. %H A103677 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a> %H A103677 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %o A103677 (PARI) is(n)=n=n!; while(n>119, my(e=valuation(n, 2), e1=valuation((n>>=e)+1, 2)); n>>=e1; if(e>2 && e1>3, return(0))); 1 \\ _Charles R Greathouse IV_, Apr 07 2013 %Y A103677 Cf. A102730, A036603, A007088, A000142, A103679, A103681. %K A103677 nonn,base %O A103677 1,3 %A A103677 _Reinhard Zumkeller_, Feb 12 2005