A019953 - OEIS

%I #12 Sep 08 2022 08:44:44

%S 1,4,2,8,1,4,8,0,0,6,7,4,2,1,1,4,5,0,2,1,6,0,6,1,8,4,8,4,9,9,8,5,0,0,

%T 7,3,9,6,3,3,8,0,1,6,1,2,0,7,5,3,1,9,0,9,7,6,1,1,7,9,4,1,2,7,2,8,1,6,

%U 9,5,5,1,7,5,2,7,9,8,8,5,3,2,9,3,7,3,0,2,5,6,4,1,2,5,3,4,0,3,5

%N Decimal expansion of tangent of 55 degrees.

%C Also the decimal expansion of cotangent of 35 degrees. - _Ivan Panchenko_, Sep 01 2014

%H Ivan Panchenko, <a href="/A019953/b019953.txt">Table of n, a(n) for n = 1..1000</a>

%e 1.4281480067421145021606184849985007396338016120753190976117941...

%t RealDigits[Tan[11*Pi/36], 10, 100][[1]] (* _G. C. Greubel_, Nov 22 2018 *)

%o (PARI) default(realprecision, 100); tan(11*Pi/36) \\ _G. C. Greubel_, Nov 22 2018

%o (Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(11*Pi(R)/36); // _G. C. Greubel_, Nov 22 2018

%o (Sage) numerical_approx(tan(11*pi/36), digits=100) # _G. C. Greubel_, Nov 22 2018

%Y Cf. A019864 (sine of 55 degrees).

%K nonn,cons

%O 1,2

%A _N. J. A. Sloane_