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 A142100 #10 Jun 17 2014 16:21:21 %S A142100 37,73,109,181,397,433,541,577,613,757,829,937,1009,1117,1153,1297 %N A142100 Duplicate of A093838. %K A142100 dead %O A142100 1,1