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A003638 Number of classes per genus in quadratic field with discriminant -4n, -n == 2,3( mod 4).
(Formerly M0191)
+0
2
1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 3, 3, 1, 1, 2, 1, 3, 4, 1, 2, 3, 1, 1, 3, 4, 2, 2, 2, 1, 2, 5, 2, 1, 2, 1, 5, 6, 1, 4, 2, 7, 1, 1, 3, 3, 3, 4, 2, 3, 5, 3, 1, 1, 7, 4, 2, 2, 2, 2, 8, 7, 2, 3, 4, 4, 1, 5, 3, 7, 3, 1, 4, 5, 3, 4 (list; graph; listen)
OFFSET

1,7

REFERENCES

D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.

CROSSREFS

Cf. A003637.

Adjacent sequences: A003635 A003636 A003637 this_sequence A003639 A003640 A003641

Sequence in context: A057431 A057060 A064894 this_sequence A094267 A136480 A050603

KEYWORD

nonn

AUTHOR

njas, Mira Bernstein

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.


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