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A097916 Numerator of 2*zeta_K(-1) where K is the totally real field Q(sqrt(n)), as n runs through the squarefree numbers. 3
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; text; internal format)
OFFSET

1,5

REFERENCES

F. Hirzebruch, Hilbert modular surfaces, Ges. Abh. II, 225-323.

LINKS

Table of n, a(n) for n=1..26.

F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183-281. See p. 200.

EXAMPLE

1/6, 1/3, 1/15, 1, 4/3, 7/3, 7/3, 1/3, 10/3, 4, ...

CROSSREFS

Cf. A097917.

Sequence in context: A021681 A114490 A182997 * A176529 A086775 A132266

Adjacent sequences:  A097913 A097914 A097915 * A097917 A097918 A097919

KEYWORD

nonn,frac,more

AUTHOR

N. J. A. Sloane, Sep 04 2004

STATUS

approved

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Last modified September 23 05:28 EDT 2021. Contains 347609 sequences. (Running on oeis4.)