A086032 - OEIS

A086032

Decimal expansion of the prime zeta modulo function at 2 for primes of the form 4k+1.

0, 5, 3, 8, 1, 3, 7, 6, 3, 5, 7, 4, 0, 5, 7, 6, 7, 0, 2, 8, 0, 6, 7, 8, 2, 8, 7, 3, 4, 1, 5, 3, 6, 5, 6, 2, 2, 8, 5, 6, 7, 5, 5, 0, 1, 4, 9, 5, 0, 8, 5, 5, 3, 2, 2, 9, 3, 9, 1, 1, 4, 2, 2, 2, 9, 5, 8, 6, 6, 8, 2, 7, 0, 4, 4, 1, 4, 2, 6, 4, 5, 1, 4, 2, 5, 2, 6, 5, 5, 7, 5, 0, 4, 2, 3, 4, 3, 8, 9, 1, 2, 9, 2, 9, 8

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,2

LINKS

Jean-François Alcover, Table of n, a(n) for n = 0..1004

R. J. Mathar, Table of Dirichlet L-series and prime zeta modulo functions for small moduli, arXiv:1008.2547 [math.NT], 2010-2015, section 3.2, constant P(m=4,n=1,s=2).

X. Gourdon and P. Sebah, Some Constants from Number theory.

OEIS index to entries related to the (prime) zeta function.

FORMULA

Zeta_Q(2) = Sum_{p in A002144} 1/p^2, where A002144 = {primes p == 1 (mod 4)}.

Equals A085548 - 1/4 - A085991. - R. J. Mathar, Apr 03 2011

Zeta_Q(2) = Sum_{odd m > 0} mu(m)/2m * log(DirichletBeta(2m)*zeta(2m)/zeta(4m)/(1 + 4^-m)) [using Gourdon & Sebah, Theorem 11]. - M. F. Hasler, Apr 26 2021

EXAMPLE

0.053813763574057670280678287341536562285675501495085532293911422295866827...

MATHEMATICA

digits = 1004; nmax0 = 100; dnmax = 10;

Clear[PrimeZeta41];

f[s_] := (1 + 2^-s)^-1*DirichletBeta[s] Zeta[s]/Zeta[2s];

PrimeZeta41[s_, nmax_] := PrimeZeta41[s, nmax] = (1/2) Sum[MoebiusMu[2n + 1]* Log[f[(2n + 1)*2]]/(2n + 1), {n, 0, nmax}] // N[#, digits+5]&;

PrimeZeta41[2, nmax = nmax0];

PrimeZeta41[2, nmax += dnmax];

While[Abs[PrimeZeta41[2, nmax] - PrimeZeta41[2, nmax - dnmax]] > 10^-(digits + 5), Print["nmax = ", nmax]; nmax += dnmax];

PrimeZeta41[2] = PrimeZeta41[2, nmax];

Join[{0}, RealDigits[PrimeZeta41[2], 10, digits][[1]]] (* Jean-François Alcover, Jun 24 2011, after X. Gourdon and P. Sebah, updated May 06 2021 *)

PROG

(PARI) From M. F. Hasler, Apr 24 2021: (Start)

PrimeZeta41(s)={suminf(n=0, my(t=s+s*n*2); moebius(2*n+1)*log(zeta(t)/zeta(2*t)*(zetahurwitz(t, 1/4)-zetahurwitz(t, 3/4))/(4^t+2^t))/(4*n+2))}

A086032_upto(N=100)={localprec(N+3); digits((PrimeZeta41(2)+1)\.1^N)[^1]} \\ (End)

CROSSREFS

Cf. A085991 (same for primes 4k+3), A175644 (for primes 3k+1), A343612 (for primes 3k+2), A086033 - A086039 (for 1/p^3, ..., 1/p^9), A085548 (PrimeZeta(2)), A002144 (primes 4k+1).

Sequence in context: A187488 A372831 A087654 * A018222 A349578 A374260

Adjacent sequences: A086029 A086030 A086031 * A086033 A086034 A086035

KEYWORD

cons,nonn

AUTHOR

Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Jul 07 2003

STATUS

approved