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A233527 Decimal expansion of arctan( 1/(2*Pi) ): opposite angle for a right triangle of equal area to a circle. 2
1, 5, 7, 8, 3, 1, 1, 9, 0, 2, 8, 8, 1, 5, 8, 8, 6, 0, 1, 6, 7, 6, 0, 8, 7, 4, 1, 7, 8, 2, 8, 1, 8, 9, 2, 3, 6, 0, 5, 0, 7, 1, 2, 4, 0, 5, 9, 9, 0, 5, 1, 0, 6, 0, 4, 1, 5, 5, 5, 7, 9, 6, 7, 2, 1, 3, 8, 2, 2, 1, 1, 9, 5, 6, 5, 1, 8, 2, 1, 0, 9, 1, 6, 0, 5, 8, 7, 1, 3, 9, 4, 4, 0, 8, 0, 3, 1, 4, 0, 0 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..99.

Wikipedia, Area of a circle: Triangle proof

FORMULA

Equals arctan(1/A019692).

Equals A019669 - A233528. [Bruno Berselli, Dec 16 2013]

EXAMPLE

0.15783119028815886016760874178281892360507124059905106041555796721382...

MATHEMATICA

RealDigits[ArcTan[1/(2 Pi)], 10, 110][[1]] (* Bruno Berselli, Dec 16 2013 *)

PROG

(PARI) atan(1/(2*Pi))

CROSSREFS

Cf. A019669, A019692, A086201, A233528.

Sequence in context: A063006 A135096 A153104 * A244355 A245278 A155855

Adjacent sequences:  A233524 A233525 A233526 * A233528 A233529 A233530

KEYWORD

nonn,cons

AUTHOR

John W. Nicholson, Dec 11 2013

EXTENSIONS

More terms from Ralf Stephan, Dec 16 2013

STATUS

approved

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Last modified May 31 13:01 EDT 2020. Contains 334748 sequences. (Running on oeis4.)