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 A135134 #2 Mar 31 2012 10:26:06 %S A135134 3257,3527,7253,7523 %N A135134 Emirps that use all of the prime digits 2,3,5,7 exactly once. %Y A135134 Cf. A134966, A006567. %K A135134 fini,full,nonn,base %O A135134 1,1 %A A135134 _Lekraj Beedassy_, Feb 12 2008