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A003638
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Number of classes per genus in quadratic field with discriminant -4n, -n == 2,3( mod 4).
(Formerly M0191)
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1
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1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 1, 3, 4, 1, 2, 3, 1, 1, 3, 4, 2, 2, 2, 1, 2, 5, 2, 1, 2, 1, 5, 6, 1, 4, 2, 7, 1, 1, 3, 3, 3, 4, 2, 3, 5, 3, 1, 1, 7, 4, 2, 2, 2, 2, 8, 7, 2, 3, 4, 4, 1, 5, 3, 7, 3, 1, 4, 5, 3, 4
(list;
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refs;
listen;
history;
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OFFSET
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1,7
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REFERENCES
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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).
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LINKS
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Table of n, a(n) for n=1..75.
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CROSSREFS
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Cf. A003637.
Sequence in context: A361025 A152805 A064894 * A094267 A136480 A050603
Adjacent sequences: A003635 A003636 A003637 * A003639 A003640 A003641
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Mira Bernstein
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STATUS
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approved
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