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A097914
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Number of points in a certain complex manifold associated with the Hilbert modular group of the totally real field Q(sqrt(n)), n squarefree, that arise from isotropy groups of order 2.
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1
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1, 2, 3, 2, 6, 4, 6, 10, 2, 12, 8, 4, 10, 4, 6, 12, 18, 6, 12, 12, 4, 12, 20, 2, 18, 16, 8
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183-281; Ges. Abh. II, 225-323.
A. Prestel, Die elliptischen Fixpunkte ..., Math. Ann., 177 (1968), 181-209.
A. Prestel, Die Fixpunkte der symmetrischen ..., Math. Ann., 200 (1973), 123-139.
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CROSSREFS
| Cf. A097915-A097918.
Sequence in context: A197289 A161888 A157224 * A113710 A054126 A144176
Adjacent sequences: A097911 A097912 A097913 * A097915 A097916 A097917
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 04 2004
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