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A222066
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Decimal expansion of 1/sqrt(128).
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12
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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
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OFFSET
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0,1
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COMMENTS
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Conjectured to be center density of densest packing of equal spheres in five dimensions (achieved for example by the D_5 lattice).
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REFERENCES
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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.
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LINKS
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Table of n, a(n) for n=0..103.
G. Nebe and N. J. A. Sloane, Home page for D_5 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).
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EXAMPLE
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.88388347648318440550105545263106129910604492211...
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PROG
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(PARI) 1/sqrt(128) \\ Charles R Greathouse IV, Oct 31 2014
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CROSSREFS
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Related constants: A020769, A020789, A093766, A093825, A222067, A222068, A222069, A222070, A222071, A222072, A222073, A222074, A222075.
Sequence in context: A254291 A219300 A200686 * A303617 A296428 A073447
Adjacent sequences: A222063 A222064 A222065 * A222067 A222068 A222069
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KEYWORD
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nonn,cons
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AUTHOR
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N. J. A. Sloane, Feb 10 2013
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STATUS
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approved
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