A019910 Decimal expansion of tangent of 12 degrees.

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

Offset

0,1

Comments

Also the decimal expansion of cotangent of 78 degrees. - Mohammad K. Azarian, Jun 30 2013

Links

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

Wikipedia, Exact trigonometric constants

Index entries for algebraic numbers, degree 8

Formula

tan(Pi/15) = A019821/A019887. - R. J. Mathar, Aug 31 2025

Smallest positive of the 8 real-valued roots of x^8-92*x^6+134*x^4-28*x^2+1=0. (Others: A019922, A019946, A019982) - R. J. Mathar, Sep 06 2025

Mathematica

RealDigits[Tan[12 Degree], 10, 120][[1]] (* Harvey P. Dale, May 10 2012 *)

Crossrefs

Sequence in context: A330405 A111934 A098509 * A084309 A047991 A296666

Adjacent sequences: A019907 A019908 A019909 * A019911 A019912 A019913

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved