A258695 - OEIS

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A258695

Maximal index of a congruence subgroup of PSL(2,Z) of genus n.

0

72, 108, 108, 168, 180, 192, 192, 216, 220, 288, 324, 288, 330, 384, 300, 384, 364, 480, 384, 504, 408, 480, 486, 504, 546

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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: A118218 A242186 A205189 * A102562 A357460 A216426

Adjacent sequences: A258692 A258693 A258694 * A258696 A258697 A258698

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Jun 07 2015

STATUS

approved