A019903 Decimal expansion of tangent of 5 degrees.

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

Offset

0,2

Comments

Also the decimal expansion of cotangent of 85 degrees. - Mohammad K. Azarian, Jun 30 2013

Or tangent of Pi/36 radians or cotangent of 17Pi/36 radians. - Alonso del Arte, Jun 30 2013

Links

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Index entries for algebraic numbers, degree 6.

Formula

From Amiram Eldar, May 19 2026: (Start)

Equals 1/A019983.

Minimal polynomial: x^6 - 12*x^5 + 3*x^4 + 40*x^3 + 3*x^2 - 12*x + 1. (End)

Example

0.0874886635259240052220186694...

Mathematica

RealDigits[Tan[Pi/36], 10, 105][[1]] (* Alonso del Arte, Jun 30 2013 *)
(* Alternative: *)
Join[{0}, RealDigits[Tan[5 Degree], 10, 120][[1]]] (* Harvey P. Dale, Aug 01 2021 *)

Prog

(PARI) tan(Pi/36) \\ Charles R Greathouse IV, May 11 2026

Crossrefs

Cf. A019983.

Sequence in context: A019870 A388551 A395391 * A327340 A167222 A076417

Adjacent sequences: A019900 A019901 A019902 * A019904 A019905 A019906

Keyword

nonn,cons

Author

N. J. A. Sloane

Extensions

Zero added in front by R. J. Mathar, Feb 05 2009

Status

approved