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 A019925 #15 Aug 31 2025 12:40:22 %S A019925 5,0,9,5,2,5,4,4,9,4,9,4,4,2,8,8,1,0,5,1,3,7,0,6,9,1,1,2,5,0,6,5,7,4, %T A019925 8,5,8,2,4,5,2,5,9,6,6,6,4,6,3,1,7,2,6,1,5,2,0,8,3,0,9,1,8,0,6,4,7,7, %U A019925 1,5,3,3,7,9,2,1,2,1,8,1,0,9,9,3,8,3,6,8,8,6,1,6,2,6,4,2,1,8,3 %N A019925 Decimal expansion of tangent of 27 degrees. %C A019925 Also the decimal expansion of cotangent of 63 degrees. - _Mohammad K. Azarian_, Jun 30 2013 %H A019925 Ivan Panchenko, <a href="/A019925/b019925.txt">Table of n, a(n) for n = 0..1000</a> %H A019925 Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a> %H A019925 <a href="/index/Al#algebraic_08">Index entries for algebraic numbers, degree 8</a> %F A019925 Root of x^8-44*x^6+166*x^4-44*x^2+1=0. - _R. J. Mathar_, Aug 31 2025 %F A019925 Equals A019836 / A019872. - _R. J. Mathar_, Aug 31 2025 %e A019925 tan(3*Pi/20) = 0.509525449... %K A019925 nonn,cons,changed %O A019925 0,1 %A A019925 _N. J. A. Sloane_