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A097917
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Denominator 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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6, 3, 15, 1, 3, 3, 3, 3, 3, 1, 3, 3, 3, 3, 3, 3, 1, 3, 3, 1, 3, 3, 3, 3, 3, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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. A097916.
Sequence in context: A050132 A128756 A049784 * A116570 A046879 A067990
Adjacent sequences: A097914 A097915 A097916 * A097918 A097919 A097920
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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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