OFFSET
1,3
LINKS
Vaclav Kotesovec, Table of n, a(n) for n = 1..501
R. J. Mathar, Table of Dirichlet L-series and prime zeta modulo functions..., arXiv:1008.2547 Zeta_{m=5,n=3}(s=2).
For links see A340628.
FORMULA
Equals Sum_{k>=1} 1/A004617(k)^2. - Amiram Eldar, Jan 24 2021
EXAMPLE
1.135764878668921626868643009472082289511936413...
MATHEMATICA
(* Using Vaclav Kotesovec's function Z from A301430. *)
$MaxExtraPrecision = 100; digits = 50; (* Adjust as needed. *)
digitize[c_] := RealDigits[Chop[N[c, digits+10]], 10, digits][[1]];
digitize[Z[5, 3, 2]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Artur Jasinski, Jan 15 2021
STATUS
approved