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A258697 Number of torsion-free congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PSL(2,Z). 0
33, 48, 49, 108, 87, 133, 55, 213, 83, 208, 133, 195, 93, 343, 72, 289, 143, 351, 71, 411, 122, 504, 152, 312, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..24.

C. J. Cummins and S. Pauli, Congruence Subgroups of PSL(2,Z) of genus less than or equal to 24 , Experimental Math., 12 (2), 2003, 243-255. See Table 1.

CROSSREFS

A258691, A102474, A258693-A258700 give the ten sequences in Table 1 of Cummins and Pauli (2003).

Sequence in context: A111458 A179244 A258698 * A204373 A111502 A080933

Adjacent sequences:  A258694 A258695 A258696 * A258698 A258699 A258700

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 07 2015

STATUS

approved

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Last modified October 18 13:39 EDT 2021. Contains 348068 sequences. (Running on oeis4.)