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 A031054 #4 Mar 30 2012 18:56:20 %S A031054 1,2,3,4,5,6,7,23,9,1,13,15,17,19,21,39,12,27,2,31,33,35,37,55,14,30, %T A031054 45,3,49,51,53,71,16,32,48,63,4,67,69,87,18,34,50,66,81,5,85,103,20, %U A031054 36,52,68,84,99,6,7,22,38,54,70,86,102,117,311,123 %N A031054 a(n)=least k such that base 8 representation of n begins at s(k), where s=A031045. %K A031054 nonn %O A031054 1,2 %A A031054 _Clark Kimberling_