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 A050321 #6 Dec 19 2015 13:02:23 %S A050321 5,10,17,20,21,23,29,34,40,42,43,46,53,58,65,68,69,71,77,80,81,83,84, %T A050321 85,86,87,89,92,93,95,101,106,113,116,117,119,125,130,136,138,139,142, %U A050321 149,154,160,162,163,166,168,169,170,171,172,174,175,178,184,186,187 %N A050321 k such that A050292(k) is different from A004396(k). %K A050321 nonn %O A050321 0,1 %A A050321 _Christian G. Bower_, Sep 15 1999