OFFSET
0,1
COMMENTS
Root of the equation -1 + 21*x^2 - 35*x^4 + 7*x^6 = 0. - Vaclav Kotesovec, Apr 04 2021
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..10000
EXAMPLE
0.228243474390149938077611362061014782...
MATHEMATICA
RealDigits[Tan[Pi/14], 10, 125][[1]] (* Amiram Eldar, Apr 27 2021 *)
PROG
(PARI) tan(Pi/14)
(SageMath) numerical_approx(tan(pi/14), digits=124) # G. C. Greubel, Sep 30 2022
CROSSREFS
KEYWORD
AUTHOR
Seiichi Manyama, Apr 04 2021
STATUS
approved