OFFSET
0,2
COMMENTS
This is the minimum ripple factor for a third-order Chebyshev filter for which the generalized reflectionless topology needs no negative elements. - Matthew A. Morgan, Oct 18 2017
LINKS
FORMULA
Equals Sum_{k>=0} binomial(2*k,k) * k/16^k. - Amiram Eldar, Aug 02 2020
EXAMPLE
0.1924500897298752548363829268339858185492005837567089586728674....
MATHEMATICA
RealDigits[1/Sqrt[27], 10, 200][[1]] (* Vladimir Joseph Stephan Orlovsky, May 30 2010 *)
PROG
(PARI) 1/sqrt(27) \\ G. C. Greubel, Feb 15 2018
(Magma) 1/Sqrt(27) // G. C. Greubel, Feb 15 2018
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
STATUS
approved