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A106032
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a(n) is the number of orbits under the action of GL_2[Z] on the primitive binary quadratic forms of discriminant D, where D>1 is the n-th fundamental discriminant.
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0
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1, 1, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 2, 2, 4, 1, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 1, 1, 2, 4, 1, 1, 4, 2, 2, 2, 3, 1, 4, 2, 3, 1, 2, 4, 1, 2, 4, 4, 2, 1, 2, 1, 2, 2, 2, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| A003646 is the same except it is under the action of SL_2[Z].
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LINKS
| S. R. Finch, Class number theory
Jens Jonasson, Classes of integral binary quadratic forms, Masters thesis (2001), Appendix B.
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EXAMPLE
| D=5,8, 12, 13, 17, 21, 24, 28, ..., that is, A003658.
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CROSSREFS
| Cf. A003658, A003646.
Sequence in context: A033941 A053256 A102418 * A003646 A201503 A112758
Adjacent sequences: A106029 A106030 A106031 * A106033 A106034 A106035
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KEYWORD
| nonn
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AUTHOR
| S. R. Finch (Steven.Finch(AT)inria.fr), May 05 2005
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