

A097917


Denominator of 2*zeta_K(1) where K is the totally real field Q(sqrt(n)), as n runs through the squarefree numbers.


3



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;
text;
internal format)



OFFSET

1,1


REFERENCES

F. Hirzebruch, Hilbert modular surfaces, Ges. Abh. II, 225323.


LINKS

Table of n, a(n) for n=1..26.
F. Hirzebruch, Hilbert modular surfaces, L'Enseignement Math., 19 (1973), 183281. See p. 200.


EXAMPLE

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


CROSSREFS

Cf. A097916.
Sequence in context: A345056 A049784 A341746 * A116570 A335567 A225503
Adjacent sequences: A097914 A097915 A097916 * A097918 A097919 A097920


KEYWORD

nonn,frac,more


AUTHOR

N. J. A. Sloane, Sep 04 2004


STATUS

approved



