A343058 Decimal expansion of tan(Pi/7).

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

Offset: 0

Author

Seiichi Manyama, Apr 04 2021

Keywords

• nonn
• cons
• easy

Comments

Root of the equation -7 + 35*x^2 - 21*x^4 + x^6 = 0. - Vaclav Kotesovec, Apr 04 2021

Examples

			0.48157461880752864433216235305697...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 0..10000
• Index entries for algebraic numbers, degree 6.

Crossrefs

Cf. A323601 (sin(Pi/7)), A073052 (cos(Pi/7)).

Programs

Mathematica

RealDigits[Tan[Pi/7], 10, 120][[1]] (* Amiram Eldar, Apr 27 2021 *)

PARI

tan(Pi/7)

SageMath

numerical_approx(tan(pi/7), digits=123) # G. C. Greubel, Sep 30 2022