A019830 - OEIS

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A019830 - OEIS

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A019830

Decimal expansion of sine of 21 degrees.

3

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

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OFFSET

0,1

LINKS

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

Wikipedia, Trigonometric constants expressed in real radicals

FORMULA

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

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

AUTHOR

N. J. A. Sloane

STATUS

approved