A270714 Decimal expansion of (1/2)^(1/3).

7, 9, 3, 7, 0, 0, 5, 2, 5, 9, 8, 4, 0, 9, 9, 7, 3, 7, 3, 7, 5, 8, 5, 2, 8, 1, 9, 6, 3, 6, 1, 5, 4, 1, 3, 0, 1, 9, 5, 7, 4, 6, 6, 6, 3, 9, 4, 9, 9, 2, 6, 5, 0, 4, 9, 0, 4, 1, 4, 2, 8, 8, 0, 9, 1, 2, 6, 0, 8, 2, 5, 2, 8, 1, 2, 1, 0, 9, 5, 8, 6, 6, 3, 6, 7, 7

Offset

0,1

Comments

Let c = (1/2)^(1/3). A sphere of radius c*r has half the volume of a sphere of radius r. - Rick L. Shepherd, Aug 12 2016

Let c = (1/2)^(1/3). The relative maximum of xy(x+y)=1 is (c,-1/c^2). - Clark Kimberling, Oct 05 2020

Links

Clark Kimberling, Table of n, a(n) for n = 0..10000

Formula

Equals 1/A002580 = A002580*A235362 = A005480*A020761. [corrected and expanded by Rick L. Shepherd, Aug 12 2016]

Equals Product_{k>=1} (1 + (-1)^k/(3*k+1)). - Amiram Eldar, Aug 10 2020

Example

0.79370052598409973737585281963615413019574666394992650490414288091260825...

Mathematica

RealDigits[(1/2)^(1/3), 10, 200][[1]]

Prog

(PARI) (1/2)^(1/3) \\ Altug Alkan, Mar 22 2016

Crossrefs

Cf. A002580, A005480, A235362, A269993.

Sequence in context: A156000 A019804 A021130 * A010516 A274169 A121168

Adjacent sequences: A270711 A270712 A270713 * A270715 A270716 A270717

Keyword

nonn,cons,easy

Author

Clark Kimberling, Mar 22 2016

Status

approved