OFFSET
1,1
COMMENTS
Also the decimal expansion of cotangent of 12 degrees. - Ivan Panchenko, Sep 01 2014
An algebraic integer of degree 8. - Charles R Greathouse IV, Nov 05 2017
LINKS
Ivan Panchenko, Table of n, a(n) for n = 1..1000
Wikipedia, Exact trigonometric constants
PROG
(PARI) 1/tan(Pi/15) \\ Charles R Greathouse IV, Nov 05 2017
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
STATUS
approved