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A003636 Number of classes per genus in quadratic field with discriminant -n.
(Formerly M2213)
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 2, 1, 1, 5, 1, 1, 2, 2, 3, 1, 2, 7, 5, 3, 1, 3, 1, 1, 4, 5, 3, 3, 4, 1, 3, 5, 1, 1, 5, 5, 1, 2, 3, 5, 1, 7, 3, 2, 5, 1, 4, 11, 1, 5, 4, 2, 1, 13, 1, 9, 2, 3, 3, 7, 2, 7, 5, 1, 3, 1, 1, 15, 3, 3, 4, 7, 3, 2, 2, 13, 2, 1, 11, 2, 1, 3, 7, 2, 2, 4, 5, 4, 5, 3, 2, 19, 1, 5, 2, 6 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,9

REFERENCES

D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=3..104.

Rick L. Shepherd, Binary quadratic forms and genus theory, Master of Arts Thesis, University of North Carolina at Greensboro, 2013.

CROSSREFS

Sequence in context: A010283 A134699 A272880 * A078929 A030728 A237712

Adjacent sequences:  A003633 A003634 A003635 * A003637 A003638 A003639

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Mira Bernstein

STATUS

approved

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Last modified September 18 09:59 EDT 2019. Contains 327170 sequences. (Running on oeis4.)