login
A054400
Decimal expansion of 4 * Product_{i=1..inf} (1-3/(2*(i+1)))^(1/2^i).
1
1, 5, 2, 6, 7, 5, 3, 3, 5, 3, 3, 5, 8, 7, 4, 1, 2, 0, 5, 2, 0, 5, 6, 7, 1, 9, 9, 1, 9, 1, 0, 9, 8, 0, 1, 4, 5, 7, 7, 4, 3, 5, 9, 2, 1, 0, 9, 6, 7, 5, 0, 7, 0, 2, 1, 5, 8, 1, 1, 6, 2, 4, 1, 9, 0, 7, 5, 9, 7, 9, 0, 6, 4, 3, 5, 5, 2, 7, 9, 0, 3, 4, 7, 9, 0, 2, 8, 1, 5, 0, 4, 6, 5, 7, 6, 9, 1, 2, 2, 7, 1, 9, 9, 0, 8
OFFSET
1,2
REFERENCES
D.-Z. Du and F. K. Hwang, Combinatorial Group Testing and Its Applications, World Scientific, 2nd ed., 2000; p. 37.
EXAMPLE
1.52675335335...
MATHEMATICA
digits = 105; 4*NProduct[ (1-3/(2*(i+1)))^(1/2^i), {i, 1, Infinity}, WorkingPrecision -> digits+5, NProductFactors -> 4*digits] // RealDigits[#, 10, digits]& // First (* Jean-François Alcover, Mar 07 2013 *)
CROSSREFS
Sequence in context: A363238 A021659 A011506 * A035568 A344964 A321074
KEYWORD
nonn,easy,cons
AUTHOR
N. J. A. Sloane, May 22 2000
EXTENSIONS
More terms from David Wasserman, Mar 04 2002
STATUS
approved