id:A003648 - OEIS Search Results

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Class number of quadratic forms with discriminant 4n, n == 2,3^( mod 4).
(Formerly M0210)

+0
2

1, 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 4, 2, 4, 4, 2, 4, 4, 2, 2, 2, 4, 4, 2, 2, 2, 4, 2, 4, 2, 2, 4, 6, 4, 2, 2, 4, 4, 2, 4, 4, 2, 2, 2, 4, 4, 4, 4, 2, 4, 2, 4, 2, 4, 2, 2, 4, 2, 6, 4, 4, 2, 4, 4, 2, 4, 2, 2, 2, 4, 4, 4, 2, 4, 4, 4, 4, 4, 2, 4, 8, 2, 2, 4, 2, 8, 2, 2, 4, 2, 8, 4, 6, 8, 2, 4, 8, 12, 4, 2, 4, 4, 2 (list; graph; listen)

	OFFSET	`2,2`
	REFERENCES	`D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	CROSSREFS	`Cf. A003647.` `Sequence in context: A035665 A027388 A083261 this_sequence A003642 A100007 A104369` `Adjacent sequences: A003645 A003646 A003647 this_sequence A003649 A003650 A003651`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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