A055109 - OEIS

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A055109

Numbers k such that Q(sqrt(-k)) has class number 6.

26, 29, 38, 53, 61, 87, 106, 109, 118, 157, 202, 214, 247, 262, 277, 298, 339, 358, 397, 411, 451, 515, 707, 771, 835, 843, 1059, 1099, 1147, 1203, 1219, 1267, 1315, 1347, 1363, 1563, 1603, 1843, 1915, 1963, 2227, 2283, 2443, 2515, 2563, 2787

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Jinyuan Wang, Table of n, a(n) for n = 1..51

Index entries for sequences related to quadratic fields

MATHEMATICA

Select[Range[10000], MoebiusMu[#] != 0 && NumberFieldClassNumber[Sqrt[-#]] == 6 &] (* Jinyuan Wang, Mar 08 2020 *)

PROG

(PARI) \\ See A005847.

CROSSREFS

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