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 A131859 #5 Dec 27 2019 23:15:15 %S A131859 1,3,9,11,16,18,21,23,24,26,29,31,33,35,41,43,48,50,53,55,56,58,61,63, %T A131859 81,83,89,91,113,115,121,123,129,131,137,139,144,146,149,151,152,154, %U A131859 157,159,161,163,169,171,176,178,181,183,184,186,189,191,209,211,217 %N A131859 Numbers m such that A131851(m) = 1. %H A131859 Seiichi Manyama, <a href="/A131859/b131859.txt">Table of n, a(n) for n = 1..10000</a> %Y A131859 Cf. A131851, A131858, A131857, A131859, A131861, A131863. %K A131859 nonn %O A131859 1,2 %A A131859 _Reinhard Zumkeller_, Jul 22 2007