OFFSET
1,1
LINKS
FORMULA
Equals (p/4)*cot(Pi/p), with p = 11.
EXAMPLE
9.36563990694543752488235845328433428788257496183502738768931...
MATHEMATICA
RealDigits[11/4 Cot[Pi/11], 10, 120][[1]] (* Harvey P. Dale, Apr 03 2016 *)
PROG
(PARI) p=11; a=(p/4)*cotan(Pi/p) \\ Use realprecision in excess
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Stanislav Sykora, Apr 12 2015
STATUS
approved