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.

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

Offset

1,1

Comments

Excludes discriminants appearing in A051990.

References

R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(2), column r.

Links

Table of n, a(n) for n=1..76.

Crossrefs

Cf. A051990, A051991, A051992, A051993, A051995, A051996, A051997, A051998.

Sequence in context: A256922 A202346 A117022 * A085661 A265276 A286474

Adjacent sequences: A051991 A051992 A051993 * A051995 A051996 A051997

Keyword

nonn,fini,full

Author

N. J. A. Sloane, Jan 04 2000

Extensions

Offset changed to 1 by Georg Fischer, Sep 21 2021

Status

approved