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 A206640 #4 Mar 30 2012 17:27:07 %S A206640 3,5,11,61,67,73,79 %N A206640 Primes in A060432. %K A206640 nonn,full,fini %O A206640 1,1 %A A206640 _Max Alekseyev_, Feb 11 2012