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

Author

N. J. A. Sloane

Keywords

• nonn
• cons
• changed

Comments

Also the decimal expansion of cotangent of 63 degrees. - Mohammad K. Azarian, Jun 30 2013

Examples

			tan(3*Pi/20) = 0.509525449...
		

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