OFFSET
0,1
COMMENTS
Atomic packing factor (APF) for the body-centered cubic lattice (bcc), one of the very common crystallographic lattice types of chemical elements and compounds.
LINKS
Stanislav Sykora, Table of n, a(n) for n = 0..2000
Eric Weisstein's World of Mathematics, Cubic Close Packing
Eric Weisstein's World of Mathematics, Sphere Packing
Wikipedia, Atomic packing factor
EXAMPLE
0.68017476158783169397277934661580839960652484303477771583870685077...
MATHEMATICA
RealDigits[Pi Sqrt[3]/8, 10, 120][[1]] (* Eric W. Weisstein, Jan 04 2019 *)
PROG
(PARI) Pi*sqrt(3)/8
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Stanislav Sykora, Apr 16 2016
STATUS
approved