This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A019896 #29 Jul 08 2025 07:42:49
%S A019896 9,9,8,6,2,9,5,3,4,7,5,4,5,7,3,8,7,3,7,8,4,4,9,2,0,5,8,4,3,9,4,3,6,5,
%T A019896 8,0,5,9,0,9,5,2,2,9,0,7,6,7,7,8,5,5,3,2,4,4,1,4,4,1,2,5,4,8,3,1,6,4,
%U A019896 8,9,7,3,7,3,3,4,7,8,3,1,8,6,3,5,3,3,2,0,2,8,2,3,3,2,7,5,4,5,0
%N A019896 Decimal expansion of sine of 87 degrees.
%C A019896 Equals sin(29*Pi/60). - _Wesley Ivan Hurt_, Sep 01 2014
%C A019896 An algebraic number of degree 16 and denominator 2. - _Charles R Greathouse IV_, Aug 27 2017
%H A019896 Ivan Panchenko, <a href="/A019896/b019896.txt">Table of n, a(n) for n = 0..1000</a>
%H A019896 Raimundas Vidunas, <a href="http://arXiv.org/abs/math.CA/0403510">Expressions for values of the gamma function</a>, math.CA/0403510
%H A019896 Wikipedia, <a href="https://en.wikipedia.org/wiki/Trigonometric_constants_expressed_in_real_radicals">Trigonometric constants expressed in real radicals</a>
%H A019896 <a href="/index/Al#algebraic_16">Index entries for algebraic numbers, degree 16</a>
%F A019896 Equals cos(Pi/60) = [5-sqrt(5)]*[1+sqrt(3)]*[2-sqrt(3)+sqrt{5+2*sqrt(5)}]/[8*sqrt(10)] = sqrt[(1+A019893)/2]. - _R. J. Mathar_, Jun 18 2006
%F A019896 Equals A019867 * A019870 + A019838 * A019841 = A019893 * A019896 + A019812 * A019815. - _R. J. Mathar_, Jan 27 2021
%e A019896 0.998629534754573873784492058439436580590952290767785532441441...
%p A019896 Digits:=100: evalf(sin(29*Pi/60)); # _Wesley Ivan Hurt_, Sep 01 2014
%t A019896 RealDigits[Sin[87Degree], 10, 100][[1]] (* _Alonso del Arte_, Aug 31 2014 *)
%o A019896 (PARI) cos(Pi/60) \\ _Charles R Greathouse IV_, Aug 27 2017
%K A019896 nonn,cons
%O A019896 0,1
%A A019896 _N. J. A. Sloane_