

A014599


Class numbers h(D) of imaginary quadratic fields with discriminant D=14*n.


3



1, 1, 1, 2, 1, 3, 1, 3, 2, 4, 1, 5, 2, 4, 3, 4, 1, 7, 2, 5, 3, 6, 2, 8, 2, 5, 3, 8, 2, 10, 2, 5, 5, 6, 3, 10, 2, 7, 4, 10, 1, 11, 4, 6, 5, 8, 2, 13, 4, 9, 4, 6, 3, 14, 4, 7, 5, 12, 2, 15, 3, 6, 7, 12, 4, 13, 2, 11, 4, 12, 3, 14, 4, 8, 8, 10, 3, 19, 4, 10, 4, 12, 3, 18, 6, 7, 5, 12, 4, 19
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OFFSET

1,4


COMMENTS

Also class number, or number of equivalence classes of positive definite binary quadratic forms of discriminant (4n1).  N. J. A. Sloane, May 28 2014


REFERENCES

D. A. Buell, Binary Quadratic Forms. SpringerVerlag, NY, 1989, pages 19 and 224230.  N. J. A. Sloane, May 28 2014
H. Cohen, Course in Computational Alg. No. Theory, Springer, 1993, pp. 5145.


LINKS

N. J. A. Sloane, Table of n, a(n) for n = 1..10000


PROG

(PARI) a(n) = qfbclassno(14*n)


CROSSREFS

See A000003 for discriminant 4n.
Sequence in context: A309634 A309633 A329632 * A274771 A075825 A309155
Adjacent sequences: A014596 A014597 A014598 * A014600 A014601 A014602


KEYWORD

nonn


AUTHOR

Eric Rains (rains(AT)caltech.edu)


STATUS

approved



