The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A222067 Decimal expansion of 1/(8*sqrt(3)). 12
 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 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 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, 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 G. Nebe and N. J. A. Sloane, Home page for E_6 lattice EXAMPLE .7216878364870322056364359756274468195595021890876585950232529... PROG (PARI) 1/sqrt(192) \\ Charles R Greathouse IV, Oct 31 2014 CROSSREFS Related constants: A020769, A020789, A093766, A093825, A222066, A222068, A222069, A222070, A222071, A222072, A222073, A222074, A222075. Sequence in context: A133362 A317925 A010140 * A154020 A060991 A120455 Adjacent sequences:  A222064 A222065 A222066 * A222068 A222069 A222070 KEYWORD nonn,cons AUTHOR N. J. A. Sloane, Feb 10 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 29 21:32 EDT 2020. Contains 333117 sequences. (Running on oeis4.)