%I A002141 M3745 N1530
%S A002141 1,1,5,6,7,7,9,53,60,66,83,83,136,136,185,185,185,312,312,312,3064,3718,
%T A002141 3718,3718,8096,9826,12384,16602,16602,16602,16760,16760,182424,323392,
               323392,323392,323392
%N A002141 Class numbers of quadratic fields.
%D A002141 D. H. Lehmer, E. Lehmer and D. Shanks, Integer sequences having prescribed 
               quadratic character, Math. Comp., 24 (1970), 433-451.
%D A002141 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A002141 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002141 <a href="Sindx_Qua.html#quadfield">Index entries for sequences related 
               to quadratic fields</a>
%Y A002141 Sequence in context: A095942 A139395 A029911 this_sequence A114547 A163508 
               A030541
%Y A002141 Adjacent sequences: A002138 A002139 A002140 this_sequence A002142 A002143 
               A002144
%K A002141 nonn
%O A002141 3,3
%A A002141 N. J. A. Sloane (njas(AT)research.att.com).