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A258693 Number of congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PGL(2,Z). 10
121, 163, 145, 241, 215, 256, 175, 388, 212, 403, 235, 381, 198, 549, 178, 485, 294, 667, 191, 647, 203, 729, 284, 537, 212 (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, Experiment. Math. Volume 12, Issue 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: A242372 A182072 A262514 * A037266 A240775 A284643

Adjacent sequences:  A258690 A258691 A258692 * A258694 A258695 A258696

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 07 2015

STATUS

approved

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Last modified April 23 03:26 EDT 2019. Contains 322380 sequences. (Running on oeis4.)