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 A031323 #4 Mar 30 2012 18:56:23 %S A031323 1,16,2,36,3,56,4,76,5,96,6,17,1,37,10,57,12,77,14,246,16,276,18,306, %T A031323 20,336,22,366,24,396,9,19,28,39,2,59,32,79,34,546,36,576,38,606,40, %U A031323 636,42,666,44,696,11,21,31,41,50,61,3,81,54,846 %N A031323 Least k such that base 10 representation of n begins at s(k), where s=A031312. %K A031323 nonn %O A031323 1,2 %A A031323 _Clark Kimberling_