A003636 - OEIS

%I M2213 #13 Dec 26 2015 02:19:54

%S 1,1,1,1,1,1,1,1,3,1,3,1,2,1,1,5,1,1,2,2,3,1,2,7,5,3,1,3,1,1,4,5,3,3,

%T 4,1,3,5,1,1,5,5,1,2,3,5,1,7,3,2,5,1,4,11,1,5,4,2,1,13,1,9,2,3,3,7,2,

%U 7,5,1,3,1,1,15,3,3,4,7,3,2,2,13,2,1,11,2,1,3,7,2,2,4,5,4,5,3,2,19,1,5,2,6

%N Number of classes per genus in quadratic field with discriminant -n.

%D D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.

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

%H Rick L. Shepherd, <a href="http://libres.uncg.edu/ir/uncg/f/Shepherd_uncg_0154M_11099.pdf">Binary quadratic forms and genus theory</a>, Master of Arts Thesis, University of North Carolina at Greensboro, 2013.

%K nonn

%O 3,9

%A _N. J. A. Sloane_, _Mira Bernstein_