A019859 Decimal expansion of sine of 50 degrees.

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

Offset

0,1

Comments

A cubic number with denominator 2 and minimal polynomial 8x^3 - 6x + 1. - Charles R Greathouse IV, Nov 05 2017

Links

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

Index entries for algebraic numbers, degree 3

Formula

Equals cos(2*Pi/9) = 2F1(5/6,1/6;1/2;3/4) / 2. - R. J. Mathar, Oct 27 2008

Equals 2*A019834*A019874. - R. J. Mathar, Jan 17 2021

Example

0.76604444...

Mathematica

RealDigits[ Cos[ 2Pi/9], 10, 111][[1]] (* Robert G. Wilson v *)
RealDigits[Sin[50 Degree], 10, 120][[1]] (* Harvey P. Dale, Dec 19 2012 *)

Prog

(PARI) sin(5/18*Pi) \\ Charles R Greathouse IV, Nov 05 2017

Crossrefs

Sequence in context: A371322 A198109 A059751 * A188736 A265304 A102769

Adjacent sequences: A019856 A019857 A019858 * A019860 A019861 A019862

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved