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 A082257 #5 May 11 2007 03:00:00 %S A082257 2,3,5,7,29,67,89,199,599,2999,4999,29989,59999,79999,389999,989999 %N A082257 Duplicate of A054750. %K A082257 dead %O A082257 1,1