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 A131594 #31 Jan 26 2025 13:17:23 %S A131594 4,7,1,4,0,4,5,2,0,7,9,1,0,3,1,6,8,2,9,3,3,8,9,6,2,4,1,4,0,3,2,3,2,6, %T A131594 9,2,8,5,6,5,5,7,2,9,1,7,9,2,3,1,6,0,2,4,3,9,2,2,2,6,5,7,9,3,3,0,2,4, %U A131594 4,1,5,9,4,8,7,3,6,9,0,1,2,9,5,0,1,2,9,1,7,8,1,0,9,2,1,3,8,5,7,5,7,8,3,3,7 %N A131594 Decimal expansion of sqrt(2)/3, the volume of a regular octahedron with edge length 1. %C A131594 Volume of a regular octahedron: V = ((sqrt(2))/3)* a^3, where 'a' is the edge. %D A131594 Jan Gullberg, Mathematics from the Birth of Numbers, W. W. Norton & Co., NY & London, 1997, ยง12.4 Theorems and Formulas (Solid Geometry), p. 450. %H A131594 Ivan Panchenko, <a href="/A131594/b131594.txt">Table of n, a(n) for n = 0..1000</a> %H A131594 Wikipedia, <a href="http://en.wikipedia.org/wiki/Platonic_solid">Platonic solid</a>. %H A131594 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a>. %F A131594 Equals A002193/3 = A010464/A010482. - _R. J. Mathar_, Dec 11 2009 %e A131594 0.471404520791031682933896... %t A131594 RealDigits[Sqrt[2]/3,10,120][[1]] (* _Harvey P. Dale_, May 27 2012 *) %o A131594 (PARI) sqrt(2)/3 \\ _G. C. Greubel_, Jul 06 2017 %Y A131594 Cf. A020829 (regular tetrahedron volume), A102208 (regular icosahedron volume), A102769 (regular dodecahedron volume). %Y A131594 Cf. A179587. %K A131594 cons,easy,nonn %O A131594 0,1 %A A131594 _Omar E. Pol_, Aug 30 2007 %E A131594 More digits from _R. J. Mathar_, Dec 11 2009