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 A151901 #7 Jan 07 2013 14:23:10 %S A151901 9,13,22,23,72,73,74,82,83,84,85,88 %N A151901 Singular indices in A139074. %C A151901 Definition: Singular indices in A139074 are numbers n such that it doesn't exist a prime p such that (n+p!)/n is prime or if this prime does exist then it is very big. %Y A151901 Cf. A139074, A139206, A151900. %K A151901 nonn %O A151901 1,1 %A A151901 _Artur Jasinski_, Apr 12 2008