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 A131855 #5 Dec 28 2019 07:46:23 %S A131855 0,1,4,5,10,11,14,15,16,17,20,21,26,27,30,31,40,41,44,45,56,57,60,61, %T A131855 64,65,68,69,74,75,78,79,80,81,84,85,90,91,94,95,104,105,108,109,120, %U A131855 121,124,125,130,131,134,135,146,147,150,151,160,161,164,165,170,171,174 %N A131855 Numbers m such that A131852(m) = 0. %H A131855 Seiichi Manyama, <a href="/A131855/b131855.txt">Table of n, a(n) for n = 1..10000</a> %Y A131855 Cf. A131852, A131853, A131854, A131857, A131862, A131864. %K A131855 nonn %O A131855 1,3 %A A131855 _Reinhard Zumkeller_, Jul 22 2007