

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
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OFFSET

0,1


COMMENTS

Atomic packing factor (APF) for the bodycentered 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 ClosePacking
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

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 A308314
Adjacent sequences: A268505 A268506 A268507 * A268509 A268510 A268511


KEYWORD

nonn,cons


AUTHOR

Stanislav Sykora, Apr 16 2016


STATUS

approved



