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A097916
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Numerator of 2*zeta_K(-1) where K is the totally real field Q(sqrt(n)), as n runs through the squarefree numbers.
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1
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1, 1, 1, 1, 4, 7, 7, 1, 10, 4, 2, 19, 2, 23, 20, 25, 1, 34, 40, 2, 46, 38, 5, 41, 52, 8
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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REFERENCES
| F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183-281; Ges. Abh. II, 225-323.
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EXAMPLE
| 1/6, 1/3, 1/15, 1, 4/3, 7/3, 7/3, 1/3, 10/3, 4, ...
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CROSSREFS
| Cf. A097917.
Sequence in context: A021681 A114490 A182997 * A176529 A086775 A132266
Adjacent sequences: A097913 A097914 A097915 * A097917 A097918 A097919
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KEYWORD
| nonn,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Sep 04 2004
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