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A051998
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Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+4k, k odd; sequence gives values of k.
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8
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1, -15, -5, -17, -19, -21, 1, -3, 1, 1, 5, 3, -33, 1, -35, -5, 5, -39, -13, -41, 3, 1, 1, -15, -3, 3, 5, 15, -7, -51, 1, 3, -55, 1, -5, 5, -3, 1, -21, -65, 5, 13, -69, 3, -15, 5, -11, 7, 3, -17, 17, -89, 29, -91, 13, -95, -5, 33, 1, -15, 35, 39, 11, 5, 1, 3, 19, 5, -11, 5, -51, 5, 53, -165, -7, -3, 1, 21, -29, -5, 21
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OFFSET
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1,2
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COMMENTS
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Excludes discriminants appearing in A051990.
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REFERENCES
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R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(3), column k.
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LINKS
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CROSSREFS
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KEYWORD
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sign,fini,full
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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