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 A066980 #12 Jan 12 2020 09:55:21 %S A066980 5,7,13,15,18,23,25,28,32,33,35,38,43,45,47,50,53,55,60,63,67,68,73, %T A066980 77,78,83,85,88,95,98,105,108,110,113,115,117,123,127,128,130,133,137, %U A066980 138,140,143,145,150,153,155,158,162,163,165,168,172,173,175,176,178,182 %N A066980 Numbers k such that antid(k) > antid(k+1) and santid(k) > santid(k+1), where antid(k) = A066272 and santid(k) = A066417. %H A066980 Amiram Eldar, <a href="/A066980/b066980.txt">Table of n, a(n) for n = 1..10000</a> %Y A066980 Cf. A066272, A066417. %K A066980 easy,nonn %O A066980 1,1 %A A066980 _Jason Earls_, Sep 09 2002