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A054400
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Decimal expansion of 4 * Product_{i=1..inf} ((1-3/(2*(i+1)))^(1/2^i).
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1
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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
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OFFSET
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1,2
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REFERENCES
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D.-Z. Du and F. K. Hwang, Combinatorial Group Testing and Its Applications, World Scientific, 2nd ed., 2000; p. 37.
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LINKS
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Table of n, a(n) for n=1..105.
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EXAMPLE
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1.52675335335...
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MATHEMATICA
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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 *)
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CROSSREFS
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4*A054399.
Sequence in context: A158624 A021659 A011506 * A035568 A344964 A321074
Adjacent sequences: A054397 A054398 A054399 * A054401 A054402 A054403
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KEYWORD
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nonn,easy,cons
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AUTHOR
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N. J. A. Sloane, May 22 2000
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EXTENSIONS
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More terms from David Wasserman, Mar 04 2002
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STATUS
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approved
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