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A258147 Decimal expansion of (4 - 3*sqrt(3)/Pi)/6: ratio of the area of a circular segment with central angle 2*Pi/3 and the area of the corresponding circular half-disk. 3
3, 9, 1, 0, 0, 2, 2, 1, 8, 9, 5, 5, 7, 7, 0, 6, 4, 1, 9, 1, 1, 0, 0, 3, 4, 1, 7, 5, 1, 0, 1, 8, 1, 9, 4, 5, 9, 6, 7, 9, 7, 3, 4, 2, 6, 4, 8, 3, 3, 4, 6, 3, 4, 0, 2, 6, 6, 9, 8, 3, 6, 5, 6, 5, 2, 1, 1, 5, 1, 5, 1, 4, 9, 3, 2, 0, 3, 1, 7, 6, 9 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

See the comments on A258146.

This is also the ratio of the area of a circular disk (radius R) without an inscribed central rectangle (2*x = R, 2*y = sqrt(3)*R) together with the two opposing circular segments each with central angle Pi/3 and the area Pi*R^2 of the circular disk.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..5000

FORMULA

2/3 - sqrt(3)/(2*Pi) = 0.39100221895577064191100...

MATHEMATICA

RealDigits[2/3 - Sqrt[3]/(2*Pi), 10, 50][[1]] (* G. C. Greubel, Oct 19 2017 *)

PROG

(PARI) 2/3 - sqrt(3)/(2*Pi) \\ Michel Marcus, Oct 19 2017

CROSSREFS

Cf. A258146, A258148.

Sequence in context: A206160 A112972 A334191 * A016673 A304022 A103556

Adjacent sequences:  A258144 A258145 A258146 * A258148 A258149 A258150

KEYWORD

nonn,cons,easy

AUTHOR

Wolfdieter Lang, May 31 2015

STATUS

approved

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Last modified May 17 09:03 EDT 2021. Contains 343969 sequences. (Running on oeis4.)