A258698 Number of torsion-free congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PGL(2,Z).

33, 48, 49, 105, 86, 125, 45, 191, 76, 203, 120, 179, 70, 303, 53, 263, 123, 317, 60, 375, 85, 450, 132, 271, 51

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: A247527 A111458 A179244 * A258697 A204373 A111502

Adjacent sequences: A258695 A258696 A258697 * A258699 A258700 A258701

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 07 2015

Status

approved