A093720 - OEIS

A093720

Decimal expansion of Sum_{n >= 2} zeta(n)/n!.

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

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OFFSET

1,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

J. Sondow and E. W. Weisstein, MathWorld: Riemann Zeta Function

FORMULA

Equals Sum_{k>=1} (exp(1/k) - 1 - 1/k). - Vaclav Kotesovec, Mar 04 2016

EXAMPLE

1.078188729575818482758265436769832381707219...

MAPLE

evalf(Sum(exp(1/n)-1-1/n, n=1..infinity), 120); # Vaclav Kotesovec, Mar 04 2016

MATHEMATICA

digits = 99; ClearAll[z, rd]; z[k_] := z[k] = z[k-1] + N[Sum[Zeta[n]/n!, {n, 2^(k-1) + 1, 2^k}], digits]; z[0] = 0; rd[k_] := rd[k] = RealDigits[z[k]][[1]]; rd[0]; rd[k = 1]; While[ rd[k] != rd[k-1], k++]; rd[k] (* Jean-François Alcover, Nov 09 2012 *)

PROG

(PARI) suminf(n=2, zeta(n)/n!) \\ Michel Marcus, Mar 15 2017

CROSSREFS

Cf. A076813, A093721, A269574, A269611, A269720, A269768.

Sequence in context: A086724 A268979 A329219 * A154216 A258947 A360381

Adjacent sequences: A093717 A093718 A093719 * A093721 A093722 A093723

KEYWORD

nonn,cons

AUTHOR

Eric W. Weisstein, Apr 12 2004

EXTENSIONS

Corrected by Fredrik Johansson, Mar 19 2006

STATUS

approved