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A081319
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Smallest squarefree integer k such that Q(sqrt(-k)) has class number n, or 0 if no such k exists.
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5
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1, 5, 23, 14, 47, 26, 71, 41, 199, 74, 167, 89, 191, 101, 239, 146, 383, 293, 311, 194, 431, 269, 647, 329, 479, 314, 983, 341, 887, 461, 719, 446, 839, 614, 1031, 626, 1487, 1199, 1439, 689, 1151, 794, 1847, 854, 1319, 941, 3023, 1106, 1511, 1109, 1559
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(38) = min{A060649(38), A344072(19)/4} = min{1199, 4916/4} = 1199. (End)
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MATHEMATICA
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t[_] := 0; k = -1; While[k > -3100, a = NumberFieldClassNumber@Sqrt@k; If[t[a] == 0, t[a] = -k; Print[{a, -k}]]; k--]; t /@ Range@51 (* Robert G. Wilson v, Sep 25 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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