A144664 - OEIS

A144664

Decimal expansion of Product_{n>=2} (n^5-1)/(n^5+1).

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

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OFFSET

0,1

LINKS

Table of n, a(n) for n=0..109.

J. Borwein et al., Experimentation in Mathematics, 2004, section 1.2.

E. W. Weisstein, Infinite Product, MathWorld.

EXAMPLE

0.92878693579955245375146991...

MATHEMATICA

p = 2*Gamma[2-(-1)^(1/5)] * Gamma[2+(-1)^(2/5)] * Gamma[2-(-1)^(3/5)] * Gamma[2+(-1)^(4/5)] / (Gamma[2+(-1)^(1/5)] * Gamma[2-(-1)^(2/5)] * Gamma[2+(-1)^(3/5)] * Gamma[2-(-1)^(4/5)]); RealDigits[Re[p], 10, 110][[1]] (* Jean-François Alcover, Feb 11 2013, updated Nov 18 2015 *)

RealDigits[Re[N[Product[(n^5 - 1)/(n^5 + 1), {n, 2, Infinity}], 110]]][[1]] (* Bruno Berselli, Apr 02 2013 *)

CROSSREFS

Cf. A090986, A255435.

Sequence in context: A011453 A125580 A086238 * A241560 A309821 A073007

Adjacent sequences: A144661 A144662 A144663 * A144665 A144666 A144667

KEYWORD

nonn,cons

AUTHOR

R. J. Mathar, Feb 01 2009

EXTENSIONS

More terms from Jean-François Alcover, Feb 11 2013

STATUS

approved