A097915 -id:A097915 - cp's OEIS frontend

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A097918 Euler numbers of complex manifolds mentioned in A097914 and A097915.

Original entry on oeis.org

1, 4, 4, 4, 6, 6, 8, 10, 4, 12, 12, 4, 14, 6, 16, 18, 20, 8, 24, 22, 6, 24, 28, 8, 28, 32, 8

Offset: 1

N. J. A. Sloane, Sep 04 2004

F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183-281; Ges. Abh. II, 225-323.

A097914 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.

Original entry on oeis.org

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

Offset: 1

N. J. A. Sloane, Sep 04 2004

F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183-281; Ges. Abh. II, 225-323.
A. Prestel, Die elliptischen Fixpunkte der Hilbertschen Modulgruppen, Math. Ann., 177 (1968), 181-209.
A. Prestel, Die Fixpunkte der symmetrischen Hilbertschen Modulgruppe zu einem reell-quadratischen Zahlkörper mit Primzahldiskriminante, Math. Ann., 200 (1973), 123-139.

Cf. A097915, A097916, A097917, A097918.

Showing 1-2 of 2 results.