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 A033040 #5 Mar 30 2012 18:56:25 %S A033040 1,3,5,7,9,11,13,16,18,20,22,24,26,28,46,48,50,52,54,56,58,76,78,80, %T A033040 82,84,86,88,106,108,110,112,114,116,118,136,138,140,142,144,146,148, %U A033040 166,168,170,172,174,176,178,196,198,200,202,204 %N A033040 Numbers all of whose base 15 digits are odd. %K A033040 nonn,base %O A033040 1,2 %A A033040 _Clark Kimberling_