A019836 Decimal expansion of sine of 27 degrees.

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

Offset

0,1

Comments

An algebraic number of degree 8 and denominator 2. - Charles R Greathouse IV, Aug 27 2017

Links

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

Wikipedia, Trigonometric constants expressed in real radicals

Index entries for algebraic numbers, degree 8

Formula

Equals A019827 * A019890 + A019818 * A019881 = A019833 * A019896 + A019812 * A019875. - R. J. Mathar, Jan 27 2021

Equals cos(7*Pi/20). 2*this^2-1 = -A019845. - R. J. Mathar, Aug 29 2025

Minimal polynomial 256*x^8 -512*x^6 +304*x^4 -48*x^2 +1. - R. J. Mathar, Jun 03 2026

Mathematica

RealDigits[Sin[27 Degree], 10, 120][[1]] (* Harvey P. Dale, Nov 09 2014 *)

Prog

(PARI) cos(7*Pi/20) \\ Charles R Greathouse IV, Aug 27 2017

Crossrefs

Sequence in context: A245085 A299420 A374677 * A388544 A353314 A020503

Adjacent sequences: A019833 A019834 A019835 * A019837 A019838 A019839

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved