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 A155893 #2 Mar 31 2012 13:48:25
%S A155893 1,2,4,16,13,3,46,27,7,14,6,32,10,39,5,20,86,50,11,26,121,18,38,4,31,
%T A155893 199,34,12,139,28,63,62,61,67,60,125,59,16,37,58,47,108,23,21,41,13,
%U A155893 112,71,194,56,25,30,302,19,166,46,55,150,83,116,219,73,90,140,164,54,207
%N A155893 Least positive integer such that a(n)! starts with n, both written in base 8.
%o A155893 (PARI) A155893(n)={ local( F=1,k=1 ); while( F\1!=n, F*=k++; while( F>=n+1, F/=8 )); k}
%Y A155893 Cf. A155891, A155892, A018799, A076219.
%K A155893 base,nonn
%O A155893 1,2
%A A155893 _M. F. Hasler_, Feb 01 2009