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A128425 Primes that are the genus of some complete graph. 1
2, 3, 5, 11, 13, 23, 29, 43, 59, 73, 83, 137, 151, 173, 181, 239, 257, 347, 463, 653, 683, 809, 859, 1093, 1151, 1171, 1231, 1553, 1669, 1693, 1789, 1913, 2311, 2423, 2837, 3121, 3251, 3623, 3943, 4583, 4861, 5023, 5483, 5569, 5743, 6053 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

G. Ringel and J. W. T. Youngs, Solution of the Heawood map-coloring problem, Proc. Nat. Acad. Sci. USA, 60 (1968), 438-445.

LINKS

Table of n, a(n) for n=1..46.

Eric Weisstein's World of Mathematics, Complete Graph.

FORMULA

A000933 INTERSECTION A000040. Primes of the form ceiling((n-3)*(n-4)/12) for n>=3.

CROSSREFS

Cf. A000040, A000933.

Sequence in context: A020607 A235631 A180640 * A175565 A262831 A036960

Adjacent sequences:  A128422 A128423 A128424 * A128426 A128427 A128428

KEYWORD

easy,nonn

AUTHOR

Jonathan Vos Post, May 04 2007

STATUS

approved

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Last modified December 10 04:15 EST 2019. Contains 329885 sequences. (Running on oeis4.)