OFFSET
1,2
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
FORMULA
Equals arcsin(4/sqrt(17)) = arccos(1/sqrt(17)). - Amiram Eldar, Jul 11 2023
EXAMPLE
arctan(4) = 1.3258176636680324650592392104284756311844406013...
MATHEMATICA
PROG
(Magma) SetDefaultRealField(RealField(125)); Arctan(4); // G. C. Greubel, Apr 13 2023
(SageMath) numerical_approx( arctan(4), digits=125) # G. C. Greubel, Apr 13 2023
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved