A019904 Decimal expansion of tangent of 6 degrees.

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

Offset

0,3

Comments

Also the decimal expansion of cotangent of 84 degrees. - Mohammad K. Azarian, Jun 30 2013

An algebraic integer of degree 8. - Charles R Greathouse IV, Nov 17 2017

Root of the polynomial 1-92*x^2+134*x^4-28*x^6+x^8=0. (Others: A019940, A019964, A019976). - R. J. Mathar, Sep 06 2025

Links

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

Wikipedia, Exact trigonometric constants

Index entries for algebraic numbers, degree 8

Formula

Equals A019815 / A019839 = A019821/(1+A019887). - R. J. Mathar, Sep 06 2025

Example

tan(Pi/30) = 0.105104235...

Mathematica

RealDigits[Tan[6 Degree], 10, 120][[1]] (* Harvey P. Dale, Jun 18 2024 *)

Prog

(PARI) tan(Pi/30) \\ Charles R Greathouse IV, Nov 17 2017

Crossrefs

Sequence in context: A021200 A265301 A380697 * A002068 A021666 A395762

Adjacent sequences: A019901 A019902 A019903 * A019905 A019906 A019907

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved