A028950 Minimal norm of n-dimensional, strictly odd, unimodular lattice.

0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 3, 3, 3, 3, 3, 3, 4, 3

Offset

0,13

References

J. H. Conway and N. J. A. Sloane, A new upper bound for the minimum of an integral lattice of determinant one, Bull. Amer. Math. Soc., 23 (1990), 383-387.

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

Links

Table of n, a(n) for n=0..33.

Crossrefs

Cf. A005136.

Sequence in context: A261913 A088601 A261675 * A094916 A036485 A331971

Adjacent sequences: A028947 A028948 A028949 * A028951 A028952 A028953

Keyword

nonn,hard

Author

N. J. A. Sloane.

Status

approved