A019830 Decimal expansion of sine of 21 degrees.

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

Offset

0,1

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 16.

Formula

Equals A019823*A019892 + A019816*A019885 = A019827*A019896 + A019812*A019881. - R. J. Mathar, Jan 27 2021

Minimal polynomial 65536*x^16 -262144*x^14 +430080*x^12 -372736*x^10 +182784*x^8 -50176*x^6 +7040*x^4 -384*x^2 +1. - R. J. Mathar, Jun 03 2026

Mathematica

RealDigits[Sin[21 Degree], 10, 120][[1]] (* Harvey P. Dale, Apr 06 2016 *)

Prog

(PARI) sin(7*Pi/60) \\ Charles R Greathouse IV, Jan 30 2016

Crossrefs

Cf. A019812, A019816, A019823, A019827, A019881, A019892, A019885, A019896.

Sequence in context: A181918 A010617 A016659 * A259238 A094355 A087334

Adjacent sequences: A019827 A019828 A019829 * A019831 A019832 A019833

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved