A258697 Number of torsion-free congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PSL(2,Z).

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

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