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A051994

Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+2k, k odd; sequence gives values of r.

+0
1

6, 7, 8, 3, 10, 11, 11, 4, 12, 14, 3, 5, 16, 17, 6, 6, 4, 20, 4, 7, 7, 3, 22, 23, 8, 5, 25, 25, 5, 26, 4, 28, 4, 29, 6, 30, 32, 11, 7, 36, 12, 13, 3, 8, 14, 44, 3, 9, 16, 7, 7, 17, 17, 4, 18, 5, 19, 4, 61, 62, 3, 2, 5, 26, 27, 17, 20, 6, 16, 39, 28, 146, 30, 23, 61, 22 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Excludes discriminants appearing in A051990.`
	REFERENCES	`R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4.`
	CROSSREFS	`Cf. A051990-A051998.` `Sequence in context: A004487 A010500 A117022 this_sequence A085661 A162594 A120207` `Adjacent sequences: A051991 A051992 A051993 this_sequence A051995 A051996 A051997`
	KEYWORD	`nonn,fini`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 04 2000`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.

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