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A222071 Decimal expansion of (1/105)*Pi^3. 13
2, 9, 5, 2, 9, 7, 8, 7, 3, 1, 4, 5, 7, 1, 2, 5, 7, 3, 0, 9, 9, 7, 7, 4, 4, 2, 9, 2, 1, 0, 4, 8, 9, 4, 7, 8, 1, 1, 6, 4, 3, 1, 3, 1, 9, 6, 7, 5, 0, 9, 6, 2, 6, 3, 7, 5, 3, 7, 5, 7, 5, 0, 5, 7, 5, 0, 5, 3, 7, 0, 9, 4, 4, 5, 2, 0, 5, 4, 3, 4, 3, 2, 1, 4, 9, 2, 0, 9, 6, 2, 2, 1, 5, 2, 6, 5, 5, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Conjectured to be density of densest packing of equal spheres in 7 dimensions (achieved for example by the E_7 lattice).

REFERENCES

J. H. Conway and N. J. A. Sloane, What are all the best sphere packings in low dimensions?, Discr. Comp. Geom., 13 (1995), 383-403.

J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer, 3rd. ed., 1998. See p. xix.

LINKS

Table of n, a(n) for n=0..97.

G. Nebe and N. J. A. Sloane, Home page for E_7 lattice

N. J. A. Sloane, Table of maximal density of a packing of equal spheres in n-dimensional Euclidean space (for n>3 the values are only conjectural).

EXAMPLE

.295297873145712573099774429210489478116431319675...

PROG

(PARI) Pi^3/105 \\ Charles R Greathouse IV, Oct 31 2014

CROSSREFS

Related constants: A020769, A020789, A093766, A093825, A222066, A222067, A222068, A222069, A222070, A222072, A222073, A222074, A222075.

Sequence in context: A076930 A011068 A078149 * A160208 A248364 A021776

Adjacent sequences:  A222068 A222069 A222070 * A222072 A222073 A222074

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane, Feb 10 2013

STATUS

approved

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Last modified March 30 18:30 EDT 2017. Contains 284302 sequences.