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A222067
Decimal expansion of 1/(8*sqrt(3)).
9
7, 2, 1, 6, 8, 7, 8, 3, 6, 4, 8, 7, 0, 3, 2, 2, 0, 5, 6, 3, 6, 4, 3, 5, 9, 7, 5, 6, 2, 7, 4, 4, 6, 8, 1, 9, 5, 5, 9, 5, 0, 2, 1, 8, 9, 0, 8, 7, 6, 5, 8, 5, 9, 5, 0, 2, 3, 2, 5, 2, 9, 0, 8, 1, 0, 4, 9, 7, 2, 0, 9, 0, 3, 7, 8, 6, 6, 6, 6, 8, 2, 1, 1, 7, 1, 4, 4, 2, 4, 4, 4, 8, 2, 1, 8, 6, 9, 0, 6, 5, 3, 1, 5, 1
OFFSET
-1,1
COMMENTS
Conjectured to be center density of densest packing of equal spheres in six dimensions (achieved for example by the E_6 lattice).
REFERENCES
J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer, 3rd. ed., 1998. See p. xix.
EXAMPLE
0.07216878364870322056364359756274468195595021890876585950232529...
MATHEMATICA
RealDigits[1/(8*Sqrt[3]), 10, 120][[1]] (* Amiram Eldar, Jun 19 2023 *)
PROG
(PARI) 1/sqrt(192) \\ Charles R Greathouse IV, Oct 31 2014
CROSSREFS
KEYWORD
nonn,cons,easy
AUTHOR
N. J. A. Sloane, Feb 10 2013
EXTENSIONS
Offset corrected by Georg Fischer, Aug 18 2022
STATUS
approved