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A091404
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Numbers n such that genus of group Gamma_0(n) is 2.
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2
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OFFSET
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1,1
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COMMENTS
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I assume it is known that there are no further terms? A reference for this would be nice.
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REFERENCES
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B. Schoeneberg, Elliptic Modular Functions, Springer-Verlag, NY, 1974, p. 103.
G. Shimura, Introduction to the Arithmetic Theory of Automorphic Functions, Princeton, 1971, see Prop. 1.40 and 1.43.
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LINKS
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Table of n, a(n) for n=1..8.
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FORMULA
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Numbers n such that A001617(n) = 2.
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CROSSREFS
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Cf. A001617, A001615, A000089, A000086, A001616, A091401, A091403.
Sequence in context: A106582 A092619 A092624 * A146755 A106556 A106554
Adjacent sequences: A091401 A091402 A091403 * A091405 A091406 A091407
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KEYWORD
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nonn,fini,full
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AUTHOR
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N. J. A. Sloane, Mar 02 2004
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STATUS
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approved
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