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 A031051 #7 Nov 21 2013 12:46:29
%S A031051 5,18,34,50,66,73,75,77,79,81,82,83,85,87,98,114,135,159,183,207,231,
%T A031051 241,244,247,250,253,255,256,259,262,279,303,327,351,375,399,423,433,
%U A031051 436,439,442,445,447,448,451,454,471,495,519
%N A031051 Position of n-th 5 in A031045.
%t A031051 Flatten[Position[Flatten[Table[Reverse[IntegerDigits[n,8]], {n,300}]], 5]] (* _Harvey P. Dale_, Aug 08 2011 *)
%K A031051 nonn
%O A031051 1,1
%A A031051 _Clark Kimberling_