OFFSET
1,1
COMMENTS
Also the decimal expansion of cotangent of 6 degrees. - Ivan Panchenko, Sep 01 2014
LINKS
Ivan Panchenko, Table of n, a(n) for n = 1..1000
Wikipedia, Exact trigonometric constants.
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
KEYWORD
nonn,cons
AUTHOR
STATUS
approved