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 A019887 Decimal expansion of sine of 78 degrees. 9
 9, 7, 8, 1, 4, 7, 6, 0, 0, 7, 3, 3, 8, 0, 5, 6, 3, 7, 9, 2, 8, 5, 6, 6, 7, 4, 7, 8, 6, 9, 5, 9, 9, 5, 3, 2, 4, 5, 9, 7, 3, 7, 8, 0, 8, 8, 6, 2, 6, 7, 7, 1, 0, 7, 8, 8, 5, 1, 7, 7, 6, 6, 3, 6, 4, 0, 5, 9, 6, 8, 3, 3, 1, 2, 0, 0, 9, 5, 1, 2, 1, 9, 9, 9, 7, 5, 8, 5, 2, 5, 4, 5, 4, 7, 8, 5, 6, 3, 6 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Equals sin(13*Pi/30). - Wesley Ivan Hurt, Aug 31 2014 A quartic number with 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 FORMULA Equals cos(Pi/15) = [sqrt(5)-1]*[1+sqrt(3)*sqrt{5+2*sqrt(5)}]/8 = [A002163-1]*[1+A002194*A019970]/8. - R. J. Mathar, Jun 18 2006 EXAMPLE 0.9781476007338056379285667478695995324597378088626771078851... MAPLE Digits:=100: evalf(sin(13*Pi/30)); # Wesley Ivan Hurt, Aug 31 2014 MATHEMATICA First@RealDigits[Sin[78 Degree], 10, 120] (* Michael De Vlieger, Aug 31 2014 *) PROG (PARI) cos(Pi/15) \\ Charles R Greathouse IV, Aug 27 2017 CROSSREFS Sequence in context: A232128 A086278 A081855 * A163931 A277774 A011359 Adjacent sequences:  A019884 A019885 A019886 * A019888 A019889 A019890 KEYWORD nonn,cons AUTHOR STATUS approved

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Last modified February 22 04:58 EST 2020. Contains 332115 sequences. (Running on oeis4.)