A019948 Decimal expansion of tangent of 50 degrees.

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

Offset

1,3

Comments

Also the decimal expansion of cotangent of 40 degrees. - Ivan Panchenko, Sep 01 2014

Links

Ivan Panchenko, Table of n, a(n) for n = 1..1000

Example

1.19175359259420995870530807186041933693070040770854385365483...

Mathematica

RealDigits[Tan[5*Pi/18], 10, 100][[1]] (* G. C. Greubel, Nov 23 2018 *)

Prog

(PARI) default(realprecision, 100); tan(5*Pi/18) \\ G. C. Greubel, Nov 23 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Tan(5*Pi(R)/18); // G. C. Greubel, Nov 23 2018
(Sage) numerical_approx(tan(5*pi/18), digits=100) # G. C. Greubel, Nov 23 2018

Crossrefs

Cf. A019859 (sine of 50 degrees).

Sequence in context: A244861 A058969 A021113 * A154207 A200101 A371095

Adjacent sequences: A019945 A019946 A019947 * A019949 A019950 A019951

Keyword

nonn,cons

Author

N. J. A. Sloane

Status

approved