A347692 Numbers k such that there is regular 2-graph on k points with smallest eigenvalue rho_2 = -5.

16, 26, 36, 76, 126, 176, 276

Offset

1,1

References

Taylor, Donald E. "Regular 2-graphs." Proceedings of the London Mathematical Society 3.2 (1977): 257-274. See Theorem 3.8 and Table 2.

Links

Table of n, a(n) for n=1..7.

Crossrefs

Sequence in context: A291093 A291966 A171144 * A204543 A155549 A064420

Adjacent sequences: A347689 A347690 A347691 * A347693 A347694 A347695

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Oct 03 2021

Status

approved