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A019864 Decimal expansion of sine of 55 degrees.

%I A019864 #22 Aug 21 2023 11:47:51
%S A019864 8,1,9,1,5,2,0,4,4,2,8,8,9,9,1,7,8,9,6,8,4,4,8,8,3,8,5,9,1,6,8,4,3,4,
%T A019864 3,1,8,9,0,0,1,1,4,6,9,0,2,6,1,6,2,0,0,8,2,5,7,5,5,5,0,4,1,2,5,4,1,8,
%U A019864 8,5,5,8,4,5,4,6,9,3,0,8,0,7,5,2,9,6,2,4,5,2,8,0,8,4,6,1,3,3,0
%N A019864 Decimal expansion of sine of 55 degrees.
%C A019864 An algebraic number of degree 12 and denominator 2. - _Charles R Greathouse IV_, Nov 05 2017
%H A019864 Ivan Panchenko, <a href="/A019864/b019864.txt">Table of n, a(n) for n = 0..1000</a>
%H A019864 <a href="/index/Al#algebraic_12">Index entries for algebraic numbers, degree 12</a>
%F A019864 Equals cos(7*Pi/36) = 2F1(19/24,5/24;1/2;3/4) / 2. - _R. J. Mathar_, Oct 27 2008
%F A019864 Equals A019853 * A019888 + A019820 * A019855 = A019859 * A019894 + A019814 * A019849. - _R. J. Mathar_, Jan 27 2021
%t A019864 RealDigits[Sin[55 Degree],10,120][[1]] (* _Harvey P. Dale_, Jan 30 2023 *)
%o A019864 (PARI) sin(11/36*Pi) \\ _Charles R Greathouse IV_, Nov 05 2017
%K A019864 nonn,cons
%O A019864 0,1
%A A019864 _N. J. A. Sloane_