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 A046085 Numbers n such that Q(sqrt(-n)) has class number 4. 6
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 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. PROG For PARI code see A005847 CROSSREFS See A003173, A005847, A006203, A046085, A046002, A055109, A046004, A055110, A046006, A055111 for class numbers 1 through 10. Sequence in context: A192290 A152010 A243750 * A054296 A155704 A105189 Adjacent sequences:  A046082 A046083 A046084 * A046086 A046087 A046088 KEYWORD nonn,fini,full AUTHOR N. J. A. Sloane, Jun 16 2000 STATUS approved

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Last modified September 17 11:27 EDT 2019. Contains 327129 sequences. (Running on oeis4.)