A102474 - OEIS

%I #27 Sep 04 2020 15:36:32

%S 132,187,177,284,261,303,230,480,277,469,304,489,269,664,268,596,410,

%T 819,273,812,308,888,365,686,336

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

%H C. J. Cummins and S. Pauli, <a href="https://web.archive.org/web/20050308112837/http://www.math.tu-berlin.de/~pauli/congruence/csg-stat.html">Congruence Subgroups of PSL(2,Z)</a>

%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. [Note two different references with similar titles]

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

%K nonn,more

%O 0,1

%A Kok Seng Chua (chuaks(AT)ihpc.a-star.edu.sg), Feb 23 2005