OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
Ernst D. Krupnikov and K. S. Kolbig, Some special cases of the generalized hypergeometric function _{q+1}F_q, J. Comp. Appl. Math. 78 (1997) 79-95
Eric Weisstein's World of Mathematics, Polygamma Function (formula 25).
Sheldon Yang, Some properties of Catalan's constant G, Internat. J. Math. Ed. Sci. Tech. 23 (4) (1992) 549-556
FORMULA
Equals 16*A247037.
Equals Psi(1, 3/4), where Psi(r, x) is the Polygamma function of order r.
Because this equals Zeta(2, 3/4), with the Hurwitz Zeta function, this is the value of the series Sum_{k>=0} 1/(k + 3/4)^2 = 16*Sum_{k>=0} 1/(4*k+3)^2 with partial sums {A173953/(n+2) / A173954(n+2)}_{n>=0}. - Wolfdieter Lang, Nov 14 2017
EXAMPLE
2.5418796476716064983976628804170782491205044129874135522813644192459406...
MATHEMATICA
RealDigits[Pi^2 - 8 Catalan, 10, 100][[1]]
PROG
(PARI) Pi^2 - 8*Catalan \\ Charles R Greathouse IV, Jan 31 2018
(PARI) zetahurwitz(2, 3/4) \\ Charles R Greathouse IV, Jan 31 2018
(Magma) SetDefaultRealField(RealField(100)); R:= RealField(); Pi(R)^2 - 8*Catalan(R); // G. C. Greubel, Aug 24 2018
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Bruno Berselli, Mar 06 2017
STATUS
approved