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A222066 Decimal expansion of 1/sqrt(128). 13


%S 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,

%T 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,

%U 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

%N Decimal expansion of 1/sqrt(128).

%C Conjectured to be center density of densest packing of equal spheres in five dimensions (achieved for example by the D_5 lattice).

%D 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.

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

%H G. Nebe and N. J. A. Sloane, <a href="http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/D5.html">Home page for D_5 lattice</a>

%H N. J. A. Sloane, <a href="/A093825/a093825.txt">Table of maximal density of a packing of equal spheres in n-dimensional Euclidean space (for n>3 the values are only conjectural).</a>

%e .88388347648318440550105545263106129910604492211...

%o (PARI) 1/sqrt(128) \\ _Charles R Greathouse IV_, Oct 31 2014

%Y Related constants: A020769, A020789, A093766, A093825, A222067, A222068, A222069, A222070, A222071, A222072, A222073, A222074, A222075.

%K nonn,cons

%O 0,1

%A _N. J. A. Sloane_, Feb 10 2013

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Last modified July 4 11:40 EDT 2020. Contains 335448 sequences. (Running on oeis4.)