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 A153809 #2 Mar 30 2012 17:33:59 %S A153809 1,2,3,5,7,9,11,13,15,17,19,21,22,23,24,25,26,27,29,31,33,34,35,36,37, %T A153809 38,39,41,43,45,46,47,48,49,50,51,52,53,54,55,56,57,59,61,63,64,65,66, %U A153809 67,68,69,71,73,75,76,77,78,79,80,81 %N A153809 Complement of A134928. %Y A153809 Cf. A134928, A134932. %K A153809 easy,nonn %O A153809 1,2 %A A153809 _Omar E. Pol_, Jan 27 2009