A131594 Decimal expansion of sqrt(2)/3, the volume of a regular octahedron with edge length 1.

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, 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, 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

Offset

0,1

Comments

Volume of a regular octahedron: V = ((sqrt(2))/3)* a^3, where 'a' is the edge.

Links

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Wikipedia, Platonic solid

Index entries for algebraic numbers, degree 2

Formula

Equals A002193/3 = A010464/A010482. - R. J. Mathar, Dec 11 2009

Example

0.471404520791031682933896...

Mathematica

RealDigits[Sqrt[2]/3, 10, 120][[1]] (* Harvey P. Dale, May 27 2012 *)

Prog

(PARI) sqrt(2)/3 \\ G. C. Greubel, Jul 06 2017

Crossrefs

Cf. A020829 (regular tetrahedron volume), A102208 (regular icosahedron volume), A102769 (regular dodecahedron volume).

Cf. A179587.

Sequence in context: A256507 A123734 A011519 * A100402 A135004 A086234

Adjacent sequences: A131591 A131592 A131593 * A131595 A131596 A131597

Keyword

cons,easy,nonn

Author

Omar E. Pol, Aug 30 2007

Extensions

More digits from R. J. Mathar, Dec 11 2009

Status

approved