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 A247446 Decimal expansion of Pi*sqrt(3)/16. 4
 3, 4, 0, 0, 8, 7, 3, 8, 0, 7, 9, 3, 9, 1, 5, 8, 4, 6, 9, 8, 6, 3, 8, 9, 6, 7, 3, 3, 0, 7, 9, 0, 4, 1, 9, 9, 8, 0, 3, 2, 6, 2, 4, 2, 1, 5, 1, 7, 3, 8, 8, 8, 5, 7, 9, 1, 9, 3, 5, 3, 4, 2, 5, 3, 8, 5, 2, 7, 3, 0, 9, 6, 4, 6, 1, 1, 9, 1, 3, 5, 3, 1, 9, 0, 7, 7, 3, 4, 3, 5, 2, 8, 9, 7, 6, 1, 2, 8, 1, 6, 6, 0, 5, 4, 1, 7 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS The atomic packing factor (APF) of the diamond cubic crystal lattice and the smallest APF among all crystallographic lattices filled by spheres of the same diameter. The APF of the body-centered-cubic (bcc) lattice packed with spheres of the same diameter is twice this value (see Examples). For other crystal lattices, see the cross-refs. LINKS Stanislav Sykora, Table of n, a(n) for n = 0..2000 Wikipedia, Diamond cubic Wikipedia, Atomic packing factor EXAMPLE 0.340087380793915846986389673307904199803262421517388857919353425385273... APF of the bcc lattice packed with spheres of the same diameter: 0.680174761587831693972779346615808399606524843034777715838706850770546... MATHEMATICA RealDigits[Pi*Sqrt[3]/16, 10, 120][[1]] (* Vaclav Kotesovec, Oct 04 2014 *) PROG (PARI) Pi*sqrt(3)/16 CROSSREFS Cf. APF's of other crystal lattices: A093825 (hcp,fcc), A019673 (simple cubic). Sequence in context: A261137 A086798 A155061 * A131099 A098800 A087666 Adjacent sequences:  A247443 A247444 A247445 * A247447 A247448 A247449 KEYWORD nonn,cons,easy AUTHOR Stanislav Sykora, Sep 29 2014 STATUS approved

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