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 A019878 #21 Aug 21 2023 11:51:35 %S A019878 9,3,3,5,8,0,4,2,6,4,9,7,2,0,1,7,4,8,9,9,0,0,4,3,0,6,3,1,3,9,5,7,0,7, %T A019878 4,1,4,0,5,9,6,5,2,6,8,5,3,7,4,6,6,8,0,6,8,8,1,6,4,9,6,8,1,1,3,9,1,4, %U A019878 9,4,9,8,2,3,6,0,2,2,3,1,6,3,6,8,2,3,7,9,8,3,0,7,4,3,8,6,0,5,5 %N A019878 Decimal expansion of sine of 69 degrees. %C A019878 An algebraic number of degree 16 and denominator 2. - _Charles R Greathouse IV_, Nov 06 2017 %H A019878 Ivan Panchenko, <a href="/A019878/b019878.txt">Table of n, a(n) for n = 0..1000</a> %H A019878 Wikipedia, <a href="https://en.wikipedia.org/wiki/Trigonometric_constants_expressed_in_real_radicals">Trigonometric constants expressed in real radicals</a> %H A019878 <a href="/index/Al#algebraic_16">Index entries for algebraic numbers, degree 16</a> %F A019878 Equals A019855 * A019876 + A019832 * A019853 = A019875 * A019896 + A019812 * A019833. - _R. J. Mathar_, Jan 27 2021 %t A019878 RealDigits[Sin[69 Degree],10,120][[1]] (* _Harvey P. Dale_, Dec 19 2011 *) %o A019878 (PARI) sin(23/60*Pi) \\ _Charles R Greathouse IV_, Nov 06 2017 %K A019878 nonn,cons %O A019878 0,1 %A A019878 _N. J. A. Sloane_