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 A137706 #15 Feb 16 2025 08:33:07 %S A137706 1,2,3,4,5,7,8,9,10,11,15,16,17,19,23,31,32,33,34,35,36,37,39,42,43, %T A137706 45,47,63,64,65,67,69,71,75,79,95,127,128,129,130,131,133,135,136,137, %U A137706 138,139,141,143,151,153,155,159,170,171,175,187,191,255,256,257,259,260 %N A137706 Smallest number at which a new Haar graph is encountered. %H A137706 Pontus von Brömssen, <a href="/A137706/b137706.txt">Table of n, a(n) for n = 1..10000</a> %H A137706 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/HaarGraph.html">Haar Graph</a> %e A137706 Haar(5) and Haar(6) are both isomorphic to the 6-cycle graph, so 5 appears in the sequence but 6 does not. %Y A137706 Cf. A272919 (numbers that uniquely index a Haar graph), A357000. %K A137706 nonn %O A137706 1,2 %A A137706 _Eric W. Weisstein_, Feb 07 2008 %E A137706 Name clarified by _Eric W. Weisstein_, Aug 19 2017