A019953 Decimal expansion of tangent of 55 degrees.

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, 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, 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

Offset

1,2

Comments

Also the decimal expansion of cotangent of 35 degrees. - Ivan Panchenko, Sep 01 2014

Links

Ivan Panchenko, Table of n, a(n) for n = 1..1000

Index entries for algebraic numbers, degree 6.

Formula

Minimal polynomial x^6 +12*x^5 +3*x^4 -40*x^3 +3*x^2 +12*x +1 . - R. J. Mathar, Jun 03 2026

Example

1.4281480067421145021606184849985007396338016120753190976117941...

Mathematica

RealDigits[Tan[11*Pi/36], 10, 100][[1]] (* G. C. Greubel, Nov 22 2018 *)

Prog

(PARI) default(realprecision, 100); tan(11*Pi/36) \\ G. C. Greubel, Nov 22 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(11*Pi(R)/36); // G. C. Greubel, Nov 22 2018
(SageMath) numerical_approx(tan(11*pi/36), digits=100) # G. C. Greubel, Nov 22 2018

Crossrefs

Cf. A019864 (sine of 55 degrees).

Sequence in context: A200693 A348681 A241298 * A241005 A029841 A112143

Adjacent sequences: A019950 A019951 A019952 * A019954 A019955 A019956

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved