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A125705 Genera g such that every orientation-preserving periodic automorphism of the closed orientable surface of genus g has an invariant circle. 0
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 27, 28, 30, 32, 35, 39, 42, 43, 44, 45, 48, 49, 50, 51, 60, 65, 66, 72, 73, 87, 90, 105 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

There are no other g with g<=10000.

LINKS

Table of n, a(n) for n=1..43.

H. Geiges & D. Rattaggi, Periodic Automorphisms of Surfaces: Invariant Circles and Maximal Orders, Experimental Mathematics, vol. 9 (2000).

CROSSREFS

Sequence in context: A233264 A198343 A094270 * A154314 A239348 A191881

Adjacent sequences:  A125702 A125703 A125704 * A125706 A125707 A125708

KEYWORD

nonn,nice,more

AUTHOR

Alex Fink, Jan 31 2007

STATUS

approved

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Last modified September 22 03:54 EDT 2020. Contains 337289 sequences. (Running on oeis4.)