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 A019979 #13 Aug 31 2025 12:35:37 %S A019979 6,3,1,3,7,5,1,5,1,4,6,7,5,0,4,3,0,9,8,9,7,9,4,6,4,2,4,4,7,6,8,1,8,6, %T A019979 0,5,9,4,4,7,3,2,0,5,0,3,1,4,9,3,1,8,1,5,1,3,1,0,0,5,3,4,9,5,7,8,5,3, %U A019979 8,4,2,1,4,1,3,2,8,9,5,8,1,7,8,6,9,0,0,8,1,3,0,0,4,5,8,8,7,7,1 %N A019979 Decimal expansion of tangent of 81 degrees. %C A019979 Also the decimal expansion of cotangent of 9 degrees. - _Ivan Panchenko_, Sep 01 2014 %H A019979 Ivan Panchenko, <a href="/A019979/b019979.txt">Table of n, a(n) for n = 1..1000</a> %H A019979 Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a> %H A019979 <a href="/index/Al#algebraic_08">Index entries for algebraic numbers, degree 8</a> %F A019979 Positive root of x^8-44*x^6+166*x^4-44*x^2+1=0. - _R. J. Mathar_, Aug 31 2025 %K A019979 nonn,cons,changed %O A019979 1,1 %A A019979 _N. J. A. Sloane_