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 A019818 Decimal expansion of sine of 9 degrees. 4
 1, 5, 6, 4, 3, 4, 4, 6, 5, 0, 4, 0, 2, 3, 0, 8, 6, 9, 0, 1, 0, 1, 0, 5, 3, 1, 9, 4, 6, 7, 1, 6, 6, 8, 9, 2, 3, 1, 3, 8, 9, 9, 8, 9, 2, 0, 8, 5, 6, 6, 0, 7, 9, 0, 0, 8, 4, 6, 4, 1, 3, 4, 6, 0, 5, 7, 7, 5, 8, 7, 9, 3, 3, 0, 5, 6, 2, 3, 5, 7, 9, 3, 3, 6, 6, 9, 5, 8, 7, 2, 6, 7, 6, 8, 4, 8, 6, 8, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Also the imaginary part of i^(1/10). - Stanislav Sykora, Apr 25 2012 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, Exact trigonometric constants, Wikipedia FORMULA 0.1564344650402308690101053194671668923138... sqrt(8-2*sqrt(10+2*sqrt(5)))/4 = sqrt((1/2)*(1 - sqrt((1/8)*(5 + sqrt(5))))). - Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 13 2006 MATHEMATICA RealDigits[Sin[9 Degree], 10, 120][[1]] (* Harvey P. Dale, Sep 15 2014 *) PROG (PARI) sin(Pi/20) \\ Charles R Greathouse IV, Aug 27 2017 CROSSREFS Sequence in context: A087197 A221216 A229073 * A187146 A128632 A197490 Adjacent sequences:  A019815 A019816 A019817 * A019819 A019820 A019821 KEYWORD nonn,cons AUTHOR STATUS approved

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Last modified August 16 00:25 EDT 2018. Contains 313782 sequences. (Running on oeis4.)