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 A141131 #11 Jan 02 2012 15:32:31 %S A141131 2,7,17,23,31,41,47,71,73,79,89,97,103,113,127,137,151,167,191,193, %T A141131 199,223,233,239,241,257,263,271,281,311,313,337,353,359,367,383,401, %U A141131 409,431,433,439,449,457,463,479,487,503,521,569,577,593,599,601,607,617 %N A141131 Duplicate of A038873. %K A141131 dead %O A141131 1,1