A002141 - OEIS

%I M3745 N1530 #20 Oct 14 2023 23:44:12

%S 1,1,5,6,7,7,9,53,60,66,83,83,136,136,185,185,185,312,312,312,3064,

%T 3718,3718,3718,8096,9826,12384,16602,16602,16602,16760,16760,182424,

%U 323392,323392,323392,323392

%N Class numbers of quadratic fields.

%D N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

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

%H D. H. Lehmer, E. Lehmer and D. Shanks, <a href="https://doi.org/10.1090/S0025-5718-1970-0271006-X">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451.

%H D. H. Lehmer, E. Lehmer and D. Shanks, <a href="/A002189/a002189.pdf">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451. [Annotated scanned copy]

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

%K nonn

%O 3,3

%A _N. J. A. Sloane_