A051992 Discriminants of 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.

85, 165, 205, 221, 285, 357, 365, 429, 533, 629, 645, 741, 957, 965, 1085, 1205, 1245, 1365, 1469, 1517, 1533, 1685, 1853, 1965, 2013, 2037, 2045, 2085, 2373, 2397, 2405, 2613, 2805, 2813, 3005, 3045, 3237, 3485, 3885, 3965, 4245, 4277

Offset: 1

Author

N. J. A. Sloane, Jan 04 2000

Keywords

• nonn
• fini
• full

Comments

Excludes discriminants appearing in A051990.

References

• R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(3), column D.

Links

• Georg Fischer, Table of n, a(n) for n = 1..81

Crossrefs

Cf. A051990, A051991, A051993, A051994, A051995, A051996, A051997, A051998.