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A215016 Decimal expansion of the product of 1 - 1/2^2^n over all n >= 0. 2
3, 5, 0, 1, 8, 3, 8, 6, 5, 4, 3, 9, 5, 6, 9, 6, 0, 8, 8, 6, 6, 5, 5, 4, 5, 2, 6, 9, 6, 6, 1, 7, 8, 8, 6, 7, 6, 4, 2, 0, 8, 6, 5, 0, 2, 1, 7, 6, 9, 2, 1, 7, 6, 9, 7, 0, 6, 4, 8, 2, 3, 3, 8, 6, 0, 4, 8, 2, 5, 6, 3, 0, 5, 3, 6, 8, 6, 9, 6, 4, 4, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Can be used to efficiently compute A014571:  A014571 = 1/2 - 1/4 * A215016.

LINKS

Table of n, a(n) for n=0..81.

Joerg Arndt, Matters Computational (The Fxtbook), p.727 (rel. 38.1-5).

R. Schroeppel and R. W. Gosper, HACKMEM #122 (1972).

EXAMPLE

0.35018386543956960886655452696617886764208650217692176970648233860482563...

MATHEMATICA

RealDigits[Product[1 - 1/2^2^n, {n, 0, Infinity}], 10, 100][[1]] (* Alonso del Arte, Jul 31 2012 *)

PROG

(PARI) prodinf(n=0, 1-1.>>2^n)

CROSSREFS

Sequence in context: A291207 A058813 A132701 * A212394 A010614 A153099

Adjacent sequences:  A215013 A215014 A215015 * A215017 A215018 A215019

KEYWORD

nonn,cons

AUTHOR

Charles R Greathouse IV, Jul 31 2012

STATUS

approved

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Last modified August 21 22:32 EDT 2019. Contains 326169 sequences. (Running on oeis4.)