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A176426
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Decimal expansion of the product 1/(1 - 1/A000668(n)^2), n= 1 to infinity.
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0
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1, 1, 4, 9, 7, 0, 5, 0, 8, 8, 1, 2, 6, 6, 9, 0, 2, 1, 5, 7, 4, 0, 6, 3, 3, 4, 4, 2, 8, 9, 5, 9, 1, 6, 5, 9, 1, 7, 3, 3, 4, 7, 0, 4, 1, 9, 1, 2, 3, 3, 9, 8, 8, 2, 3, 7, 0, 0, 2, 3, 4, 7, 2, 6, 6, 8, 9, 9, 8, 5, 5, 8, 6, 6, 4, 4, 0, 6, 1, 3, 4, 8, 6, 2, 1, 8, 5, 5, 8, 6, 5, 2, 8, 2, 9, 9, 8, 7, 3, 8, 1
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OFFSET
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1,3
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LINKS
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EXAMPLE
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equals 1.149705...
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MATHEMATICA
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$MaxExtraPrecision = 200;
a = Flatten[Table[If[PrimeQ[2^n - 1], 2^n - 1, {}], {n, 0, 2000}]];
c = N[Product[1/(1 - 1/a[[n]]^2), {n, 1, Length[a]}], 100];
Table[Mod[Floor[10^n*c], 10], {n, 0, 100}]
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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Invalid claim concerning A065443 removed, keyword:cons inserted, offset corrected - The Assoc. Eds. of the OEIS, Apr 23 2010
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STATUS
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approved
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