A005136 Highest minimal norm of n-dimensional unimodular lattice. (Formerly M0057)

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

Offset

0,9

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.

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

Links

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

Crossrefs

Sequence in context: A025869 A093320 A082370 * A138474 A058761 A050119

Adjacent sequences: A005133 A005134 A005135 * A005137 A005138 A005139

Keyword

nonn,hard

Author

N. J. A. Sloane

Extensions

The terms continue: 3 or 4, 3 or 4, 4, 3 or 4, 3 or 4, 3 or 4, 4 (at dim 40).

Status

approved