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A065479 Decimal expansion of product(1 - 1/(p^2-p-1)), p prime >= 3). 2
7, 1, 5, 4, 6, 8, 2, 3, 5, 9, 8, 9, 9, 5, 5, 8, 4, 5, 0, 9, 4, 7, 7, 4, 7, 0, 5, 7, 1, 1, 7, 2, 8, 0, 7, 7, 6, 7, 5, 9, 7, 6, 2, 4, 8, 9, 8, 3, 7, 6, 7, 7, 6, 7, 4, 2, 6, 7, 2, 4, 7, 6, 9, 4, 4, 2, 4, 9, 5, 3, 5, 5, 5, 5, 1, 9, 7, 5, 5, 8, 5, 6, 8, 3, 3, 1, 5, 5, 5, 4, 0, 9, 0, 9, 0, 1, 1, 3 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..97.

G. Niklasch, Some number theoretical constants: 1000-digit values [Cached copy]

EXAMPLE

0.715468235989955845094774705711728...

MATHEMATICA

$MaxExtraPrecision = 600; digits = 98; terms = 600; P[n_] := PrimeZetaP[n] - 1/2^n; LR = LinearRecurrence[{2, 2, -3, -2}, {0, 0, -2, -3}, 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-Fran├žois Alcover, Apr 18 2016 *)

CROSSREFS

Cf. A065491, A078089.

Sequence in context: A181722 A021587 A195496 * A263202 A011478 A118307

Adjacent sequences:  A065476 A065477 A065478 * A065480 A065481 A065482

KEYWORD

cons,nonn

AUTHOR

N. J. A. Sloane, Nov 19 2001

STATUS

approved

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Last modified August 14 13:36 EDT 2018. Contains 313751 sequences. (Running on oeis4.)