OFFSET
0,1
LINKS
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
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Jun 07 2015
STATUS
approved