login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 8 03:17 EST 2021. Contains 349590 sequences. (Running on oeis4.)