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A091404 Numbers n such that genus of group Gamma_0(n) is 2. 2
22, 23, 26, 28, 29, 31, 37, 50 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

I assume it is known that there are no further terms? A reference for this would be nice.

REFERENCES

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.

LINKS

Table of n, a(n) for n=1..8.

FORMULA

Numbers n such that A001617(n) = 2.

CROSSREFS

Cf. A001617, A001615, A000089, A000086, A001616, A091401, A091403.

Sequence in context: A106582 A092619 A092624 * A114963 A146755 A106556

Adjacent sequences:  A091401 A091402 A091403 * A091405 A091406 A091407

KEYWORD

nonn,fini,full

AUTHOR

N. J. A. Sloane, Mar 02 2004

STATUS

approved

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Last modified December 21 20:27 EST 2014. Contains 252326 sequences.