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A034257
Maximal discrete supergroups of Gamma_0(n).
0
1, 3, 3, 7, 3, 9, 3, 11, 9, 9
OFFSET
1,2
REFERENCES
J. H. Conway, Understanding groups like Gamma_0(N), in Groups, Difference Sets and the Monster, de Gruyter, (1996), 327-343.
FORMULA
a(prime) = 3. - Sean A. Irvine, Aug 15 2020
CROSSREFS
Sequence in context: A193934 A030316 A208884 * A145501 A370296 A182139
KEYWORD
nonn,more
AUTHOR
STATUS
approved