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Search: id:A006641
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| A006641 |
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Class number of forms with discriminant -A003657(n), or equivalently class number of imaginary quadratic field with discriminant -A003657(n).
(Formerly M0112)
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+0
3
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| 1, 1, 1, 1, 1, 2, 1, 2, 3, 2, 3, 2, 4, 2, 1, 5, 2, 2, 4, 4, 3, 1, 4, 7, 5, 3, 4, 6, 2, 2, 8, 5, 6, 3, 8, 2, 6, 10, 4, 2, 5, 5, 4, 4, 3, 10, 2, 7, 6, 4, 10, 1, 8, 11, 4, 5, 8, 4, 2, 13, 4, 9, 4, 3, 6, 14, 4, 7, 5, 4, 12, 2
(list; graph; listen)
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OFFSET
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1,6
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REFERENCES
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D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.
H. Cohen, Course in Computational Alg. No. Theory, Springer, 1993, p. 514.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..3000
S. R. Finch, Class number theory
Eric Weisstein's World of Mathematics, Class Number
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CROSSREFS
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Adjacent sequences: A006638 A006639 A006640 this_sequence A006642 A006643 A006644
Sequence in context: A136625 A086520 A012265 this_sequence A115756 A067731 A130634
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KEYWORD
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nonn,easy,nice
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AUTHOR
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njas
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