This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A268508 #26 Feb 16 2025 08:33:30 %S A268508 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, %T A268508 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, %U A268508 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 %N A268508 Decimal expansion of Pi*sqrt(3)/8. %C A268508 Atomic packing factor (APF) for the body-centered cubic lattice (bcc), one of the very common crystallographic lattice types of chemical elements and compounds. %H A268508 Stanislav Sykora, <a href="/A268508/b268508.txt">Table of n, a(n) for n = 0..2000</a> %H A268508 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CubicClosePacking.html">Cubic Close Packing</a> %H A268508 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SpherePacking.html">Sphere Packing</a> %H A268508 Wikipedia, <a href="http://en.wikipedia.org/wiki/Atomic_packing_factor">Atomic packing factor</a> %H A268508 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A268508 0.68017476158783169397277934661580839960652484303477771583870685077... %t A268508 RealDigits[Pi Sqrt[3]/8, 10, 120][[1]] (* _Eric W. Weisstein_, Jan 04 2019 *) %o A268508 (PARI) Pi*sqrt(3)/8 %Y A268508 Cf. A000796 (Pi), A002194 (sqrt(3)), A180317 (sqrt(3)/80). %Y A268508 APF's of other lattices: A093825 (fcc,hcp), A019673 (simple cubic), A247446 (diamond cubic). %K A268508 nonn,cons %O A268508 0,1 %A A268508 _Stanislav Sykora_, Apr 16 2016