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Search: id:A006371
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| A006371 |
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Number of reduced binary quadratic forms of discriminant -n.
(Formerly M0207)
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+0
3
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| 1, 1, 1, 1, 1, 2, 2, 2, 1, 2, 3, 2, 2, 2, 3, 3, 2, 3, 4, 2, 1, 4, 5, 4, 2, 2, 4, 4, 3, 4, 5, 4, 1, 4, 7, 3, 3, 4, 5, 6, 3
(list; graph; listen)
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OFFSET
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3,6
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REFERENCES
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H. Davenport, The Higher Arithmetic. Cambridge Univ. Press, 5th edition, 1982, p. 144.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
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Cf. A006374.
Sequence in context: A109037 A120965 A151931 this_sequence A000177 A162545 A162544
Adjacent sequences: A006368 A006369 A006370 this_sequence A006372 A006373 A006374
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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