login
A019982
Decimal expansion of tangent of 84 degrees.
1
9, 5, 1, 4, 3, 6, 4, 4, 5, 4, 2, 2, 2, 5, 8, 4, 9, 2, 9, 6, 8, 3, 9, 7, 1, 4, 5, 4, 9, 4, 5, 6, 8, 2, 4, 6, 6, 6, 4, 8, 7, 6, 8, 1, 4, 5, 1, 5, 0, 6, 5, 9, 2, 2, 7, 3, 1, 1, 2, 6, 4, 8, 9, 1, 4, 6, 9, 8, 1, 0, 6, 9, 9, 9, 9, 7, 1, 6, 7, 4, 9, 4, 2, 7, 3, 5, 4, 2, 3, 1, 2, 1, 7, 3, 9, 3, 7, 8, 2
OFFSET
1,1
COMMENTS
Also the decimal expansion of cotangent of 6 degrees. - Ivan Panchenko, Sep 01 2014
FORMULA
From Amiram Eldar, Apr 07 2022: (Start)
Equals tan(78 degrees) + tan(72 degrees) + tan(60 degrees).
Equals sqrt(23 + 10*sqrt(5) + 2*sqrt(3*(85 + 38*sqrt(5)))).
The 4th positive and largest root of x^8 - 92*x^6 + 134*x^4 - 28*x^2 + 1 = 0. (End)
MATHEMATICA
RealDigits[Tan[7*Pi/15], 10, 100][[1]] (* Amiram Eldar, Apr 07 2022 *)
CROSSREFS
Sequence in context: A019881 A049256 A256191 * A198421 A262178 A154483
KEYWORD
nonn,cons
STATUS
approved