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A006376 Number of indecomposable positive definite ternary quadratic forms of determinant n.
(Formerly M0402)
1

%I M0402 #15 Dec 17 2021 11:27:25

%S 0,0,0,1,0,0,1,1,0,1,0,1,1,0,0,1,1,1,2,3,1,2,1,3,2,1,2,5,1,1,3,5,2,3,

%T 1,5,5,2,2,6,2,2,5,6,3,3,3,8,4,3

%N Number of indecomposable positive definite ternary quadratic forms of determinant n.

%D J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 398.

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

%H A. Schiemann, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/index.html#cryst">Brandt-Intrau tables recomputed</a>

%Y Cf. A006377, A071136.

%K nonn,nice,more

%O 1,19

%A _N. J. A. Sloane_

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Last modified May 10 22:16 EDT 2024. Contains 372388 sequences. (Running on oeis4.)