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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 (list; constant; graph; refs; listen; history; text; internal format)
 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 Wikipedia, Atomic packing factor FORMULA Equal EXAMPLE 0.68017476158783169397277934661580839960652484303477771583870685077... MATHEMATICA First@ RealDigits@ N[Pi*Sqrt[3]/8, 120] (* Michael De Vlieger, Apr 17 2016 *) 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 A097909 Adjacent sequences:  A268505 A268506 A268507 * A268509 A268510 A268511 KEYWORD nonn,cons AUTHOR Stanislav Sykora, Apr 16 2016 STATUS approved

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Last modified August 14 09:05 EDT 2018. Contains 313750 sequences. (Running on oeis4.)