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 A019875 Decimal expansion of sine of 66 degrees. 6
 9, 1, 3, 5, 4, 5, 4, 5, 7, 6, 4, 2, 6, 0, 0, 8, 9, 5, 5, 0, 2, 1, 2, 7, 5, 7, 1, 9, 8, 5, 3, 1, 7, 1, 7, 7, 9, 4, 0, 8, 1, 0, 4, 5, 9, 3, 7, 7, 4, 7, 4, 5, 4, 5, 0, 6, 0, 9, 9, 9, 7, 8, 8, 0, 6, 5, 1, 1, 4, 8, 8, 2, 1, 0, 2, 6, 3, 1, 2, 7, 1, 6, 8, 1, 7, 8, 4, 0, 0, 0, 8, 9, 3, 2, 9, 9, 9, 9, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS 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(2*Pi/15) = 2* A019887^2 -1= 1-2*A019821^2 . - R. J. Mathar, Jun 18 2006 PROG (PARI) cos(2*Pi/15) \\ Charles R Greathouse IV, Aug 27 2017 CROSSREFS Sequence in context: A010167 A154181 A239121 * A248557 A198819 A176520 Adjacent sequences:  A019872 A019873 A019874 * A019876 A019877 A019878 KEYWORD nonn,cons AUTHOR STATUS approved

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Last modified May 26 22:57 EDT 2019. Contains 323597 sequences. (Running on oeis4.)