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 A136403 #2 Mar 31 2012 10:23:23 %S A136403 4,8,15,20,24,35,39,40,51,52,55,56,68 %N A136403 Absolute values of negative fundamental discriminants (A003657) that are not 3 mod 4 (A002145). %C A136403 All terms are composite numbers (A002808). %Y A136403 Cf. A002145, A002808, A003657. %K A136403 nonn %O A136403 1,1 %A A136403 _Paul Muljadi_, Mar 30 2008