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 A241561 #46 Jan 06 2017 08:17:45 %S A241561 3,5,7,10,11,13,14,17,19,21,22,23,26,27,29,31,33,34,37,38,39,41,43,44, %T A241561 46,47,51,52,53,55,57,58,59,61,62,65,67,68,69,71,73,74,75,76,78,79,82, %U A241561 83,85,86,87,89,92,93,94,95,97,101,102,103,105,106,107,109,111,113,114 %N A241561 Duplicate of A071561. %K A241561 dead %O A241561 1,1