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 A086242 Decimal expansion of the sum of 1/(p-1)^2 over all primes p. 7
 1, 3, 7, 5, 0, 6, 4, 9, 9, 4, 7, 4, 8, 6, 3, 5, 2, 8, 7, 9, 1, 7, 2, 5, 3, 1, 3, 0, 5, 2, 2, 4, 3, 9, 6, 9, 9, 1, 7, 9, 5, 9, 9, 9, 6, 0, 1, 7, 5, 3, 1, 7, 4, 5, 8, 7, 0, 9, 1, 8, 9, 3, 3, 5, 8, 9, 1, 2, 3, 5, 7, 1, 3, 1, 4, 1, 5, 5, 5, 2, 5, 5, 4, 2, 9, 9, 0, 7, 6, 5, 2, 4, 1, 6, 5, 8, 8, 1, 1, 4, 5, 2, 7, 6, 0, 6, 5, 7, 4, 4, 8, 0, 6, 5, 7, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Henri Cohen, Number Theory, Volume II: Analytic and Modern Tools, GTM Vol. 240, Springer, 2007; see pp. 208-209. Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, pp. 94-98. LINKS Henri Cohen, High precision computation of Hardy-Littlewood Constants (dvi), 1998. Henri Cohen, High-precision computation of Hardy-Littlewood constants. [pdf copy, with permission] Eric Weisstein's World of Mathematics, Prime Sums. Eric Weisstein's World of Mathematics, Prime Factor. FORMULA Sum_{k>=2} (k-1)*primezeta(k). - Robert Gerbicz, Sep 12 2012 a(n) = lim_{n -> infinity} A119686(n)/A334746(n). - Petros Hadjicostas, May 11 2020 EXAMPLE 1.37506499474863528791725313052243969917959996017... MATHEMATICA digits = 116; Np = NSum[(n-1)*PrimeZetaP[n], {n, 2, Infinity}, NSumTerms -> 3*digits, WorkingPrecision -> digits+10]; RealDigits[Np, 10, digits] // First (* Jean-François Alcover, Sep 02 2015 *) PROG (PARI) default(realprecision, 256); (f(k)=return(sum(n=1, 1024, moebius(n)/n*log(zeta(k*n))))); sum(k=2, 1024, (k-1)*f(k)) /* Robert Gerbicz, Sep 12 2012 */ (PARI) sumeulerrat(1/(p-1)^2) \\ Amiram Eldar, Mar 19 2021 CROSSREFS Cf. A119686, A334746. Sequence in context: A301755 A302558 A193506 * A322931 A096627 A065084 Adjacent sequences:  A086239 A086240 A086241 * A086243 A086244 A086245 KEYWORD nonn,cons AUTHOR Eric W. Weisstein, Jul 13 2003 EXTENSIONS More digits copied from Cohen's paper by R. J. Mathar, Dec 05 2008 More terms from Robert Gerbicz, Sep 12 2012 STATUS approved

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Last modified May 18 03:03 EDT 2021. Contains 343994 sequences. (Running on oeis4.)