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A003639
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Number of classes per genus in Q(sqrt -n), n squarefree.
(Formerly M0085)
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0
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 3, 3, 3, 1, 3, 1, 2, 1, 1, 3, 2, 4, 1, 1, 2, 5, 1, 3, 2, 1, 1, 3, 3, 4, 2, 2, 1, 2, 1, 7, 2, 5, 2, 1, 5, 2, 3, 1, 5, 3, 6, 1, 1, 4, 4, 2, 7, 1, 5, 1, 3, 3, 3, 3, 4, 4, 2, 1, 3, 5, 5, 1, 5, 3, 1, 5, 1, 7, 4, 2, 3, 2, 2, 5, 2, 8, 7, 7, 2, 2, 3, 4, 5, 4, 1, 1, 5, 11, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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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).
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CROSSREFS
| Sequence in context: A128115 A091318 A198898 * A174110 A061916 A076348
Adjacent sequences: A003636 A003637 A003638 * A003640 A003641 A003642
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein
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