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A258698 Number of torsion-free congruence subgroups of PSL(2,Z) of genus n, up to conjugacy in PGL(2,Z). 0

%I #14 Jul 14 2016 08:34:05

%S 33,48,49,105,86,125,45,191,76,203,120,179,70,303,53,263,123,317,60,

%T 375,85,450,132,271,51

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

%H C. J. Cummins and S. Pauli, <a href="http://www.emis.de/journals/EM/expmath/volumes/12/12.2/pp243_255.pdf">Congruence Subgroups of PSL(2,Z) of genus less than or equal to 24 </a>, Experimental Math., 12 (2), 2003, 243-255. See Table 1.

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

%K nonn,more

%O 0,1

%A _N. J. A. Sloane_, Jun 07 2015

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Last modified April 12 22:48 EDT 2024. Contains 371639 sequences. (Running on oeis4.)