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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

%I

%S 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

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

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

%H F. Hirzebruch, <a href="http://www.maths.ed.ac.uk/~v1ranick/papers/hirzhilb.pdf">Hilbert modular surfaces</a>, L'Enseignement Math., 19 (1973), 183-281. See p. 200.

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

%Y Cf. A097916.

%K nonn,frac,more

%O 1,1

%A _N. J. A. Sloane_, Sep 04 2004

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Last modified September 27 15:44 EDT 2021. Contains 347691 sequences. (Running on oeis4.)