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A243376
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Decimal expansion of 2*K/Pi, a constant related to the asymptotic evaluation of the number of positive integers all of whose prime factors are congruent to 3 modulo 4, where K is the Landau-Ramanujan constant.
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1
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4, 8, 6, 5, 1, 9, 8, 8, 8, 3, 8, 5, 8, 9, 0, 9, 9, 7, 1, 2, 7, 2, 4, 5, 6, 4, 0, 5, 8, 6, 8, 2, 3, 4, 0, 5, 5, 3, 8, 1, 7, 1, 9, 8, 1, 7, 3, 9, 5, 4, 1, 2, 1, 3, 6, 8, 8, 1, 5, 4, 5, 1, 0, 8, 1, 6, 2, 9, 8, 5, 5, 0, 9, 3, 2, 0, 7, 5, 8, 1, 7, 1, 4, 7, 6, 0, 2, 0, 2, 1, 0, 3, 8, 1, 0, 6, 9, 3, 7, 1, 2
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OFFSET
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0,1
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REFERENCES
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Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 2.3 Landau-Ramanujan constant, p. 100.
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LINKS
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FORMULA
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2*K/Pi, where K is the Landau-Ramanujan constant (A064533).
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EXAMPLE
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0.4865198883858909971272456405868234...
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MATHEMATICA
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digits = 101; LandauRamanujanK = 1/Sqrt[2]*NProduct[((1 - 2^(-2^n))*Zeta[2^n]/DirichletBeta[2^n])^(1/2^(n + 1)), {n, 1, 24}, WorkingPrecision -> digits + 5]; 2*LandauRamanujanK/Pi // RealDigits[#, 10, digits] & // First (* updated Mar 14 2018 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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