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A137706 Smallest number at which a new Haar graph is encountered. 1

%I

%S 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 45,47,63,64,65,67,69,71,75,79,95,127,128,129,130,131,133,135,136,137,

%U 138,139,141,143,151,153,155,159,170,171,175,187,191,255,256,257,259,260

%N Smallest number at which a new Haar graph is encountered.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/HaarGraph.html">Haar Graph</a>

%e Haar(5) and Haar(6) are both isomorphic to the 6-cycle graph, so 5 appears in the sequence but 6 does not.

%Y Cf. A272919 (numbers that uniquely index a Haar graph).

%K nonn

%O 1,2

%A _Eric W. Weisstein_, Feb 07 2008

%E Name clarified by _Eric W. Weisstein_, Aug 19 2017

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Last modified June 4 17:14 EDT 2020. Contains 334828 sequences. (Running on oeis4.)