OFFSET
0,1
LINKS
G. Niklasch, Some number theoretical constants: 1000-digit values. [Cached copy]
EXAMPLE
0.7881625000302207005769495930535...
MATHEMATICA
$MaxExtraPrecision = 600; digits = 98; terms = 600; P[n_] := PrimeZetaP[n];
LR = Join[{0, 0, 0}, LinearRecurrence[{0, 2, 1, -1, -1}, {-3, 0, -5, -3, -7}, terms + 10]]; r[n_Integer] := LR[[n]]; Exp[NSum[r[n]*P[n - 1]/(n - 1), {n, 3, terms}, NSumTerms -> terms, WorkingPrecision -> digits + 10]] // RealDigits[#, 10, digits]& // First (* Jean-François Alcover, Apr 18 2016 *)
PROG
(PARI) prodeulerrat(1 - 1/(p*(p^2-1))) \\ Amiram Eldar, Mar 13 2021
CROSSREFS
KEYWORD
cons,nonn
AUTHOR
N. J. A. Sloane, Nov 19 2001
STATUS
approved