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A019819 Decimal expansion of sine of 10 degrees. 5
1, 7, 3, 6, 4, 8, 1, 7, 7, 6, 6, 6, 9, 3, 0, 3, 4, 8, 8, 5, 1, 7, 1, 6, 6, 2, 6, 7, 6, 9, 3, 1, 4, 7, 9, 6, 0, 0, 0, 3, 7, 5, 6, 7, 7, 1, 8, 4, 0, 6, 9, 3, 8, 7, 2, 3, 6, 2, 4, 1, 3, 7, 8, 1, 3, 2, 0, 6, 5, 8, 2, 2, 1, 3, 9, 0, 1, 4, 7, 3, 5, 4, 2, 1, 5, 1, 6, 6, 1, 3, 1, 5, 7, 3, 9, 9, 5, 7, 4 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also the imaginary part of i^(1/9). Stanislav Sykora, Apr 25 2012

LINKS

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

FORMULA

Equals cos(4*Pi/9) = 2F1(7/6,-1/6;1/2;3/4) / 2 = - 2F1(4/3,-1/3;1/2;3/4) / 2. - R. J. Mathar, Oct 27 2008

From Artur Jasinski, Oct 28 2008: (Start)

Decimal expansion of root of cubic polynomial 1 - 6x + 8x^3.

Decimal expansion of casus irreducibilis:

1/2 ((-i sqrt(3) - 1)/2)^(2/3) + ((i sqrt(3) - 1)/2)^(2/3)). (End)

MATHEMATICA

First[RealDigits[Root[1 - 6 #1 + 8 #1^3 &, 2], 10, 100]] [Artur Jasinski, Oct 28 2008]

RealDigits[ Sin[Pi/18], 10, 111]  (* Robert G. Wilson v *)

PROG

(PARI) sin(Pi/18) \\ Charles R Greathouse IV, Apr 25 2012

CROSSREFS

Sequence in context: A091682 A073016 A238695 * A215693 A197028 A257819

Adjacent sequences:  A019816 A019817 A019818 * A019820 A019821 A019822

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 23 04:06 EDT 2017. Contains 290958 sequences.