OFFSET
1,1
COMMENTS
See the second comment of A220086.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
FORMULA
Equals Pi*sec(Pi/14)/A220609.
EXAMPLE
2.0675117265602293530246124063088269435592142114923875...
MATHEMATICA
RealDigits[Gamma[3/7], 10, 90][[1]]
PROG
(Maxima) fpprec:90; ev(bfloat(gamma(3/7)));
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Bruno Berselli, Dec 17 2012
STATUS
approved