Search: id:A003639
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%I A003639 M0085
%S A003639 1,1,1,1,1,1,1,1,1,2,1,2,1,1,1,3,3,3,1,3,1,2,1,1,3,2,4,1,1,2,5,1,3,2,1,
%T A003639 1,3,3,4,2,2,1,2,1,7,2,5,2,1,5,2,3,1,5,3,6,1,1,4,4,2,7,1,5,1,3,3,3,3,4,
%U A003639 4,2,1,3,5,5,1,5,3,1,5,1,7,4,2,3,2,2,5,2,8,7,7,2,2,3,4,5,4,1,1,5,11,3
%N A003639 Number of classes per genus in Q(sqrt -n), n square-free.
%D A003639 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.
%D A003639 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%Y A003639 Sequence in context: A175023 A128115 A091318 this_sequence A061916 A076348 
               A113310
%Y A003639 Adjacent sequences: A003636 A003637 A003638 this_sequence A003640 A003641 
               A003642
%K A003639 nonn
%O A003639 1,10
%A A003639 N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein

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