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A268508
Decimal expansion of Pi*sqrt(3)/8.
1
6, 8, 0, 1, 7, 4, 7, 6, 1, 5, 8, 7, 8, 3, 1, 6, 9, 3, 9, 7, 2, 7, 7, 9, 3, 4, 6, 6, 1, 5, 8, 0, 8, 3, 9, 9, 6, 0, 6, 5, 2, 4, 8, 4, 3, 0, 3, 4, 7, 7, 7, 7, 1, 5, 8, 3, 8, 7, 0, 6, 8, 5, 0, 7, 7, 0, 5, 4, 6, 1, 9, 2, 9, 2, 2, 3, 8, 2, 7, 0, 6, 3, 8, 1, 5, 4, 6, 8, 7, 0, 5, 7, 9, 5, 2, 2, 5, 6, 3, 3, 2, 1, 0, 8, 3
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
Eric Weisstein's World of Mathematics, Cubic Close Packing
Eric Weisstein's World of Mathematics, Sphere Packing
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
Cf. A000796 (Pi), A002194 (sqrt(3)), A180317 (sqrt(3)/80).
APF's of other lattices: A093825 (fcc,hcp), A019673 (simple cubic), A247446 (diamond cubic).
Sequence in context: A041829 A042497 A011315 * A021151 A200116 A360500
KEYWORD
nonn,cons
AUTHOR
Stanislav Sykora, Apr 16 2016
STATUS
approved