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 A098049 #3 Nov 10 2007 03:00:00 %S A098049 103,127,139,331,349,421,457,463,607,661,673,691,739,829,967,1657,1669 %N A098049 Duplicate of A055628. %K A098049 dead %O A098049 1,1