A046085 Numbers n such that Q(sqrt(-n)) has class number 4.

14, 17, 21, 30, 33, 34, 39, 42, 46, 55, 57, 70, 73, 78, 82, 85, 93, 97, 102, 130, 133, 142, 155, 177, 190, 193, 195, 203, 219, 253, 259, 291, 323, 355, 435, 483, 555, 595, 627, 667, 715, 723, 763, 795, 955, 1003, 1027, 1227, 1243, 1387, 1411, 1435, 1507, 1555

Offset: 1

Author

N. J. A. Sloane, Jun 16 2000

Keywords

• nonn
• fini
• full

Comments

Contains 54 numbers [Arno, Theorem 7], ..., 1387, 1411, 1435, 1507 and 1555. [R. J. Mathar, May 01 2010]

Links

• Steven Arno, The imaginary quadratic fields of class number 4, Acta Arithm. vol 60 issue 4 (1991).
• Steven Arno, M. L. Robinson, Ferrell S. Wheeler, Imaginary quadratic fields with small odd class number, Acta Arith. 83 (1998) 295-330.
• Keith Matthews, Tables of imaginary quadratic fields with small class numbers
• Eric Weisstein's World of Mathematics, Pythagorean Triple.
• Index entries for sequences related to quadratic fields

Crossrefs

See A003173, A005847, A006203, A046085, A046002, A055109, A046004, A055110, A046006, A055111 for class numbers 1 through 10.

Programs

PARI

\\ See A005847