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A006375
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Number of reduced indefinite binary forms of determinant -n.
(Formerly M0080)
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2
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2, 1, 1, 3, 2, 1, 1, 2, 4, 2, 1, 2, 2, 1, 2, 5, 2, 2, 1, 3, 2, 1, 1, 3, 6, 2, 2, 2, 2, 2, 1, 3, 2, 2, 2, 7, 3, 1, 2, 4, 2, 2, 1, 2, 4, 1, 1, 4, 6, 3, 2, 3, 2, 2, 2, 3, 2, 2, 1, 4, 2, 1, 3, 8, 2, 2, 1, 3, 2, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 362.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A006371, A006374.
Sequence in context: A171850 A087782 A066099 * A184441 A172279 A164953
Adjacent sequences: A006372 A006373 A006374 * A006376 A006377 A006378
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KEYWORD
| nonn,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Corrected Apr 15 1995
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