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A005474 Class numbers of quadratic fields.
(Formerly M2215)

%I M2215

%S 1,1,1,1,1,3,1,3,5,3,3,7,3,5,7,3,3,5,9,7,3,5,5,15,9,19,5,13,9,9,5,19,

%T 9,5,7,15,13,9,9,15,25,13,9,27,19,15,21,7,13,11,23,9,13,13,11,33,15,

%U 25,23,15,13

%N Class numbers of quadratic fields.

%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

%H D. Shanks, <a href="http://dx.doi.org/10.1090/S0025-5718-1974-0352049-8">The simplest cubic fields</a>, Math. Comp., 28 (1974), 1137-1152.

%H <a href="/index/Qua#quadfield">Index entries for sequences related to quadratic fields</a>

%K nonn

%O 1,6

%A _N. J. A. Sloane_.

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Last modified May 6 19:52 EDT 2021. Contains 343586 sequences. (Running on oeis4.)