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 A019845 Decimal expansion of sine of 36 degrees. 8
 5, 8, 7, 7, 8, 5, 2, 5, 2, 2, 9, 2, 4, 7, 3, 1, 2, 9, 1, 6, 8, 7, 0, 5, 9, 5, 4, 6, 3, 9, 0, 7, 2, 7, 6, 8, 5, 9, 7, 6, 5, 2, 4, 3, 7, 6, 4, 3, 1, 4, 5, 9, 9, 1, 0, 7, 2, 2, 7, 2, 4, 8, 0, 7, 5, 7, 2, 7, 8, 4, 7, 4, 1, 6, 2, 3, 5, 1, 9, 5, 7, 5, 0, 8, 5, 0, 4, 0, 4, 9, 8, 6, 2, 7, 4, 1, 3, 3, 5 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS This sequence is also decimal expansion of cosine of 54 degrees. - Mohammad K. Azarian, Jun 29 2013 The ratio of side to longer diagonal for any golden rhombus (see A019881). - Rick L. Shepherd, Apr 10 2017 LINKS Zak Seidov, Table of n, a(n) for n = 0..999 Wikipedia, Exact trigonometric constants FORMULA sin 36 degrees = sin Pi/5 radians = sqrt((1/8)(5 - sqrt(5))). Equals A019881/A001622. - Rick L. Shepherd, Apr 10 2017 This constant is (1/2)*A182007. - Wolfdieter Lang, May 08 2018 EXAMPLE sin 36 degrees = 0.587785252292473129168705954639... MATHEMATICA RealDigits[Sin[Pi/5], 10, 100][[1]] (* Alonso del Arte, Sep 19 2017 *) RealDigits[Sin[36 Degree], 10, 120][[1]] (* Harvey P. Dale, Aug 14 2018 *) PROG (PARI) sin(Pi/5) \\ Michel Marcus, Apr 25 2015 (PARI) cos(3*Pi/10) \\ Rick L. Shepherd, Apr 10 2017 (PARI) real(I^(3/5)) \\ Rick L. Shepherd, Apr 10 2017 CROSSREFS Cf. A019827 (sine of 18 degrees), A019881 (sine of 72 degrees), A001622 (golden ratio phi). A182007. Sequence in context: A243598 A230366 A197415 * A143618 A177056 A053787 Adjacent sequences:  A019842 A019843 A019844 * A019846 A019847 A019848 KEYWORD nonn,cons,easy AUTHOR STATUS approved

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Last modified May 26 17:49 EDT 2019. Contains 323597 sequences. (Running on oeis4.)