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A051996
Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+k, k odd; sequence gives values of k.
8
1, -1, 1, 5, -1, 3, -7, 1, -3, -5, 5, -11, 1, -1, 1, 13, -1, 7, -15, -3, 5, -1, 1, 3, 1, -5, 21, -1, 1, 1, -13, -15, 3, 15, -31, 1, -1, 1, 17, -35, -7, 5, -1, 1, 19, -39, -3, -5, 5, 41, 3, 5, -23, 1, 1, -3, 17, 13, -1, -19, -29, 1, -3, 5, -31, 21, 33, -3, -7, 35, 3, 1, -15, -19, -39, 5, 41, -21, -11, 11, 5, 1, 5, -55, 55, 29, 5, -11, 1, -35, 35, 1, -7, -3, 1, 1, -15, 21
OFFSET
1,4
REFERENCES
R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(1), column k.
KEYWORD
sign,fini,full
AUTHOR
N. J. A. Sloane, Jan 04 2000
EXTENSIONS
a(73) and following from Georg Fischer, Sep 21 2021
STATUS
approved