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 A031097 #4 Mar 30 2012 18:56:20 %S A031097 1,2,3,4,5,6,7,8,26,10,1,14,16,18,20,22,24,44,13,30,2,34,36,38,40,42, %T A031097 62,15,33,50,3,54,56,58,60,80,17,35,53,70,4,74,76,78,98,19,37,55,73, %U A031097 90,5,94,96,116,21,39,57,75,93,110,6,114,134,23,41 %N A031097 a(n)=least k such that base 9 representation of n begins at s(k), where s=A031087. %K A031097 nonn %O A031097 1,2 %A A031097 _Clark Kimberling_