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 A019872 #21 Aug 31 2025 13:24:55 %S A019872 8,9,1,0,0,6,5,2,4,1,8,8,3,6,7,8,6,2,3,5,9,7,0,9,5,7,1,4,1,3,6,2,6,3, %T A019872 1,2,7,7,0,5,1,8,5,1,9,0,3,6,0,8,8,7,4,5,4,0,5,5,2,2,2,8,4,5,2,2,4,9, %U A019872 2,2,7,4,1,7,6,1,3,5,2,2,4,3,7,7,9,3,8,5,8,2,7,3,4,8,6,1,4,7,7 %N A019872 Decimal expansion of sine of 63 degrees. %C A019872 An algebraic number of degree 8 and denominator 2. - _Charles R Greathouse IV_, Nov 06 2017 %H A019872 Ivan Panchenko, <a href="/A019872/b019872.txt">Table of n, a(n) for n = 0..1000</a> %H A019872 Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a> %H A019872 <a href="/index/Al#algebraic_08">Index entries for algebraic numbers, degree 8</a> %F A019872 Equals A019851 * A019878 + A019830 * A019857 = A010527 * A019896 + A019812 * (1/2). - _R. J. Mathar_, Jan 27 2021 %F A019872 This^2 + A019836^2=1. - _R. J. Mathar_, Aug 31 2025 %F A019872 One of the 8 real-valued roots of 256*x^8-512*x^6+304*x^4-48*x^2+1=0. (Other A019890, A019836, A019818) - _R. J. Mathar_, Aug 31 2025 %t A019872 RealDigits[Sin[63 Degree],10,120][[1]] (* _Harvey P. Dale_, Oct 31 2018 *) %o A019872 (PARI) sin(31/60*Pi) \\ _Charles R Greathouse IV_, Nov 06 2017 %K A019872 nonn,cons,changed %O A019872 0,1 %A A019872 _N. J. A. Sloane_