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 A019955 #16 Sep 08 2022 08:44:44 %S A019955 1,5,3,9,8,6,4,9,6,3,8,1,4,5,8,2,9,0,4,8,2,6,7,9,6,9,7,2,6,0,2,7,8,0, %T A019955 1,2,5,7,0,8,3,8,7,0,3,2,1,6,5,4,8,1,6,7,9,7,9,9,1,8,5,5,0,3,0,0,2,3, %U A019955 3,3,5,6,6,9,4,9,0,8,4,1,2,5,4,0,8,1,5,7,6,6,3,6,7,8,2,9,6,5,5 %N A019955 Decimal expansion of tangent of 57 degrees. %C A019955 Also the decimal expansion of cotangent of 33 degrees. - _Ivan Panchenko_, Sep 01 2014 %H A019955 Ivan Panchenko, <a href="/A019955/b019955.txt">Table of n, a(n) for n = 1..1000</a> %H A019955 Wikipedia, <a href="http://en.wikipedia.org/wiki/Exact_trigonometric_constants">Exact trigonometric constants</a> %F A019955 Equals cot(11*Pi/90) = (1/4)*(2 - sqrt(2*(5 - sqrt(5))))*(2 - (2 + sqrt(3))*(3 + sqrt(5))). - _G. C. Greubel_, Nov 22 2018 %e A019955 1.5398649638145829048267969726027801257083870321654816797991855... %t A019955 RealDigits[Tan[57 Degree],10,120][[1]] (* _Harvey P. Dale_, Jul 20 2016 *) %t A019955 RealDigits[Tan[19*Pi/60], 10, 100][[1]] (* _G. C. Greubel_, Nov 22 2018 *) %o A019955 (PARI) default(realprecision, 100); tan(19*Pi/60) \\ _G. C. Greubel_, Nov 22 2018 %o A019955 (Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(19*Pi(R)/60); // _G. C. Greubel_, Nov 22 2018 %o A019955 (Sage) numerical_approx(tan(19*pi/60), digits=100) # _G. C. Greubel_, Nov 22 2018 %Y A019955 Cf. A019866 (sine of 56 degrees). %K A019955 nonn,cons %O A019955 1,2 %A A019955 _N. J. A. Sloane_