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A051997
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 k.
8
-1, 1, 1, 3, 1, -1, 1, -3, 1, -1, -5, 3, 1, -1, -3, 3, -5, 1, 5, -3, 3, 7, -1, -1, -3, -5, -1, 1, 5, 1, -7, -1, 7, 1, -5, 1, -1, 3, 5, 1, 3, -3, 13, 5, 3, 1, -15, -5, 3, -7, 7, -3, 3, 13, -3, -11, 3, -15, 1, -1, -21, -33, 15, 3, -3, -5, 5, -17, 7, 3, 5, 1, -5, 7, 3, -13
OFFSET
1,4
COMMENTS
Excludes discriminants appearing in A051990.
REFERENCES
R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(2), column k.
KEYWORD
sign,fini,full
AUTHOR
N. J. A. Sloane, Jan 04 2000
EXTENSIONS
Offset changed to 1 by Georg Fischer, Sep 21 2021
STATUS
approved