A019962 Decimal expansion of tangent of 64 degrees.

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

Offset

1,1

Comments

Also the decimal expansion of cotangent of 26 degrees. - Ivan Panchenko, Sep 01 2014

Links

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

Index entries for algebraic numbers, degree 24.

Formula

From Amiram Eldar, Jun 15 2026: (Start)

Equals 1/A019924.

Minimal polynomial: x^24 - 852*x^22 + 26562*x^20 - 288452*x^18 + 1465839*x^16 - 3852456*x^14 + 5407388*x^12 - 3994152*x^10 + 1475055*x^8 - 250372*x^6 + 15810*x^4 - 276*x^2 + 1. (End)

Example

2.050303841579296216899011070541494146767519622743242423472666...

Mathematica

RealDigits[Tan[16*Pi/45], 10, 100][[1]] (* G. C. Greubel, Nov 21 2018 *)
(* Alternative: *)
RealDigits[Tan[64 Degree], 10, 120][[1]] (* Harvey P. Dale, Dec 29 2019 *)

Prog

(PARI) default(realprecision, 100); tan(16*Pi/45) \\ G. C. Greubel, Nov 21 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(16*Pi(R)/45); // G. C. Greubel, Nov 21 2018
(SageMath) numerical_approx(tan(16*pi/45), digits=100) # G. C. Greubel, Nov 21 2018

Crossrefs

Cf. A019874 (sine of 64 degrees), A019924.

Sequence in context: A058974 A369744 A326059 * A086131 A355875 A318889

Adjacent sequences: A019959 A019960 A019961 * A019963 A019964 A019965

Keyword

nonn,cons,changed

Author

N. J. A. Sloane

Status

approved