OFFSET
0,1
COMMENTS
LINKS
Stanislav Sykora, Table of n, a(n) for n = 0..2000
Wikipedia, Constructible number
Wikipedia, Regular polygon
FORMULA
Equals 2*sin(Pi/13) = 2*cos(Pi*11/26).
EXAMPLE
0.47863132857511553429750745252042379040634604547661202671031943...
MATHEMATICA
RealDigits[N[2Sin[Pi/13], 100]][[1]] (* Robert Price, May 01 2016 *)
PROG
(PARI) 2*sin(Pi/13)
CROSSREFS
KEYWORD
AUTHOR
Stanislav Sykora, May 01 2016
STATUS
approved