A019925 Decimal expansion of tangent of 27 degrees.

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

Offset

0,1

Comments

Also the decimal expansion of cotangent of 63 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

Root of x^8-44*x^6+166*x^4-44*x^2+1=0. - R. J. Mathar, Aug 31 2025

Equals A019836 / A019872. - R. J. Mathar, Aug 31 2025

Example

tan(3*Pi/20) = 0.5095254494944288105137069112506574858245259666463...

Mathematica

First[RealDigits[Tan[27 Degree], 10, 100]] (* Paolo Xausa, Nov 16 2025 *)

Crossrefs

Sequence in context: A271175 A367740 A196769 * A101115 A200633 A196820

Adjacent sequences: A019922 A019923 A019924 * A019926 A019927 A019928

Keyword

nonn,cons,easy

Author

N. J. A. Sloane

Status

approved