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

1,2

Links

Pontus von Brömssen, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Haar Graph

Example

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

Crossrefs

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

Sequence in context: A334273 A114994 A357006 * A324766 A336621 A039224

Adjacent sequences: A137703 A137704 A137705 * A137707 A137708 A137709

Keyword

nonn

Author

Eric W. Weisstein, Feb 07 2008

Extensions

Name clarified by Eric W. Weisstein, Aug 19 2017

Status

approved