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 A138892 #4 Mar 30 2012 17:33:54 %S A138892 0,5,7,9,10,12,14,15,17,19,20,21,22,23,24,25,27,29,30,31,32,33,34,35, %T A138892 37,39,40,41,42,43,44,45,46,49,50,51,52,54,55,56,58,59,60,61,63,64,65, %U A138892 66,67,68,70,71,73,74,75,76,78,79,80,81,83,84,85,86,88,89,90,91,92,93,94 %N A138892 Non-Ulam numbers. %C A138892 Nonnegative integers that are not in A002858. %Y A138892 Cf. A001690, A002858. %K A138892 nonn %O A138892 0,2 %A A138892 _Omar E. Pol_, Apr 18 2008