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

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, 45, 47, 63, 64, 65, 67, 69, 71, 75, 79, 95, 127, 128, 129, 130, 131, 133, 135, 136, 137, 138, 139, 141, 143, 151, 153, 155, 159, 170, 171, 175, 187, 191, 255, 256, 257, 259, 260

Offset: 1

Author

Eric W. Weisstein, Feb 07 2008

Keywords

• nonn

Examples

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

Links

• Pontus von Brömssen, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Haar Graph

Crossrefs

Cf. A272919 (numbers that uniquely index a Haar graph), A357000.

Extensions

Name clarified by Eric W. Weisstein, Aug 19 2017