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A222066 Decimal expansion of 1/sqrt(128). 11
0, 8, 8, 3, 8, 8, 3, 4, 7, 6, 4, 8, 3, 1, 8, 4, 4, 0, 5, 5, 0, 1, 0, 5, 5, 4, 5, 2, 6, 3, 1, 0, 6, 1, 2, 9, 9, 1, 0, 6, 0, 4, 4, 9, 2, 2, 1, 1, 0, 5, 9, 2, 5, 4, 5, 7, 3, 5, 4, 2, 4, 8, 3, 6, 2, 4, 4, 2, 0, 7, 7, 9, 9, 0, 3, 8, 8, 1, 6, 8, 9, 9, 2, 8, 1, 4, 9, 2, 2, 0, 8, 9, 5, 4, 7, 7, 5, 9, 8, 2, 9, 5, 9, 3, 8 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Conjectured to be center density of densest packing of equal spheres in five dimensions (achieved for example by the D_5 lattice).
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer, 3rd. ed., 1998. See p. xix.
LINKS
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.
G. Nebe and N. J. A. Sloane, Home page for D_5 lattice
FORMULA
Equals A020789/2. - R. J. Mathar, Jan 27 2021
EXAMPLE
.088388347648318440550105545263106129910604492211...
MATHEMATICA
Join[{0}, RealDigits[1/Sqrt[128], 10, 120][[1]]] (* Harvey P. Dale, Sep 20 2023 *)
PROG
(PARI) 1/sqrt(128) \\ Charles R Greathouse IV, Oct 31 2014
CROSSREFS
Sequence in context: A254291 A219300 A200686 * A303617 A296428 A073447
KEYWORD
nonn,cons
AUTHOR
N. J. A. Sloane, Feb 10 2013
STATUS
approved

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)