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A003651
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Class number of real quadratic field with discriminant 4n, n == 2,3 ( mod 4).
(Formerly M0066)
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1
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1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 2, 2, 1, 2, 2, 1, 2, 2, 1, 1, 1, 2, 2, 2, 1, 1, 2, 1, 2, 1, 2, 2, 3, 4, 1, 1, 2, 2, 1, 2, 2, 1, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2, 1, 4, 1, 1, 2, 1, 3, 2, 2, 1, 2, 2, 1, 2, 1, 1, 1, 4, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 4, 1, 2, 2, 1, 4, 1, 1, 2, 2, 4, 2, 3, 8, 1, 2, 4, 6, 2, 1, 2, 2, 1, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 2,5
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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
| Cf. A003650.
Sequence in context: A120675 A072699 A143589 * A073203 A073204 A034003
Adjacent sequences: A003648 A003649 A003650 * A003652 A003653 A003654
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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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