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A065469 Decimal expansion of product(1 - 1/(p^2-1)), p prime >= 2). 3
5, 3, 0, 7, 1, 1, 8, 2, 0, 4, 7, 2, 0, 4, 4, 7, 9, 4, 9, 7, 2, 9, 4, 3, 7, 7, 2, 4, 7, 2, 9, 7, 7, 1, 7, 0, 9, 4, 7, 8, 6, 1, 0, 2, 2, 2, 0, 9, 8, 6, 0, 4, 0, 3, 4, 7, 5, 8, 1, 9, 0, 4, 9, 2, 8, 0, 9, 0, 5, 0, 6, 7, 9, 2, 6, 0, 9, 5, 7, 9, 0, 6, 3, 8, 6, 3, 8, 1, 9, 2, 4, 5, 6, 3, 6, 2, 3, 5 (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]

FORMULA

Product of A013661 by A065474. - R. J. Mathar, Mar 26 2011

EXAMPLE

0.53071182047204479497294377247...

MATHEMATICA

$MaxExtraPrecision = 800; digits = 98; terms = 800; P[n_] := PrimeZetaP[n]; LR = LinearRecurrence[{0, 3, 0, -2}, {0, 0, -2, 0}, 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. A072101.

Sequence in context: A144481 A232225 A200126 * A249522 A243381 A282887

Adjacent sequences:  A065466 A065467 A065468 * A065470 A065471 A065472

KEYWORD

cons,nonn

AUTHOR

N. J. A. Sloane, Nov 19 2001

STATUS

approved

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Last modified October 21 06:18 EDT 2019. Contains 328292 sequences. (Running on oeis4.)