OFFSET
-1,2
LINKS
Carl Pomerance, Andrzej Schinzel, Multiplicative Properties of Sets of Residues, Moscow Journal of Combinatorics and Number Theory. 2011. Vol. 1. Iss. 1. pp. 52-66. See p. 62.
FORMULA
Sum_{p prime} 1/(p^2-1)^4.
Sum_{n>0} (n(n+1)(n+2)/6) P(2n+6) where P is the prime zeta P function.
EXAMPLE
0.0125930283986420136529911022622921769473432089854221861472578936695...
MATHEMATICA
digits = 101; m0 = 2 digits; Clear[rd]; rd[m_] := rd[m] = RealDigits[eta4 = Sum[n(n+1)(n+2)/6 PrimeZetaP[2n+6], {n, 1, m}], 10, digits][[1]]; rd[m0]; rd[m = 2 m0]; While[rd[m] != rd[m-m0], Print[m]; m = m+m0]; Print[N[eta4, digits]]; rd[m]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Jean-François Alcover, Mar 17 2019
STATUS
approved