A085011 Decimal expansion of 4*Product_{k>=0} (1 - 1/(2^k+1)).

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

Offset

0,1

Links

Table of n, a(n) for n=0..103.

Formula

Equals 4 * A083864. - Amiram Eldar, May 28 2021

Example

0.8388448835902...

Prog

(PARI) 4*prod(k=0, 1000, 1-1./(2^k+1))
(PARI) 4*prodinf(k=0, 1-1/(2^k+1)) \\ Amiram Eldar, May 28 2021

Crossrefs

Cf. A083864.

Sequence in context: A019866 A006833 A368008 * A250129 A099724 A024568

Adjacent sequences: A085008 A085009 A085010 * A085012 A085013 A085014

Keyword

cons,nonn

Author

Benoit Cloitre, Jun 19 2003

Extensions

Leading zero removed by R. J. Mathar, Feb 05 2009

Status

approved