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 A019814 #27 Aug 29 2025 15:12:43
%S A019814 0,8,7,1,5,5,7,4,2,7,4,7,6,5,8,1,7,3,5,5,8,0,6,4,2,7,0,8,3,7,4,7,3,5,
%T A019814 5,1,3,7,7,7,0,1,1,5,6,1,4,9,7,0,2,6,7,2,6,1,3,7,4,3,3,6,7,5,6,8,4,2,
%U A019814 9,8,2,7,4,8,1,6,7,6,3,3,0,5,3,7,4,0,1,2,4,8,2,7,6,9,9,6,3,7,2,1
%N A019814 Decimal expansion of sine of 5 degrees.
%C A019814 An algebraic number of degree 12 and denominator 2. - _Charles R Greathouse IV_, Aug 27 2017
%H A019814 Ivan Panchenko, <a href="/A019814/b019814.txt">Table of n, a(n) for n = 0..1000</a>
%H A019814 <a href="/index/Al#algebraic_12">Index entries for algebraic numbers, degree 12</a>
%F A019814 Equals A019813 * A019898 + A019810 * A019895. - _R. J. Mathar_, Jan 27 2021
%F A019814 Equals sin(Pi/36) = cos(17*Pi/36). 2*this^2-1 = -A019889. - _R. J. Mathar_, Aug 29 2025
%F A019814 One of the 12 real-valued roots of 4096*x^12 -12288*x^10 +13824*x^8 -7168*x^6 +1680*x^4 -144*x^2 +1 =0. - _R. J. Mathar_, Aug 29 2025
%e A019814 0.087155...
%t A019814 Join[{0},RealDigits[Sin[5 Degree],10,120][[1]]] (* _Harvey P. Dale_, Jun 06 2018 *)
%o A019814 (PARI) sin(Pi/36) \\ _Charles R Greathouse IV_, Aug 27 2017
%Y A019814 Cf. A019810, A019813, A019895, A019898.
%K A019814 nonn,cons,changed
%O A019814 0,2
%A A019814 _N. J. A. Sloane_
%E A019814 Zero added in front by _R. J. Mathar_, Feb 05 2009