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

Author

Benoit Cloitre, Jun 19 2003

Keywords

• cons
• nonn

Examples

			0.8388448835902...
		

Crossrefs

Cf. A083864.

Programs

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

Formula

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

Extensions

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