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A005136 Highest minimal norm of n-dimensional unimodular lattice.
(Formerly M0057)
1
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 (list; graph; refs; listen; history; text; internal format)
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 entries continue: 3 or 4, 3 or 4, 4, 3 or 4, 3 or 4, 3 or 4, 4 (at dim 40).

STATUS

approved

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Last modified October 24 01:20 EDT 2018. Contains 316541 sequences. (Running on oeis4.)