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A028950 Minimal norm of n-dimensional, strictly odd, unimodular lattice. 0
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 25 20:01 EDT 2020. Contains 337344 sequences. (Running on oeis4.)