A268508 Decimal expansion of Pi*sqrt(3)/8.

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

Author

Stanislav Sykora, Apr 16 2016

Keywords

• nonn
• cons

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.

Examples

			0.68017476158783169397277934661580839960652484303477771583870685077...
		

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
• Index entries for transcendental numbers

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).

Programs

Mathematica

RealDigits[Pi Sqrt[3]/8, 10, 120][[1]] (* Eric W. Weisstein, Jan 04 2019 *)

PARI

Pi*sqrt(3)/8