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A352771
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Decimal expansion of the unique real solution to exp(x) = 1/x - 1.
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0
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4, 0, 1, 0, 5, 8, 1, 3, 7, 5, 4, 1, 5, 4, 7, 0, 3, 5, 6, 5, 0, 6, 2, 5, 3, 7, 5, 0, 0, 6, 4, 5, 6, 6, 2, 9, 0, 9, 5, 6, 0, 6, 9, 8, 6, 5, 0, 4, 5, 9, 7, 7, 7, 6, 3, 6, 9, 5, 9, 6, 4, 9, 2, 0, 7, 7, 8, 6, 9, 6, 3, 9, 9, 5, 4, 5, 7, 9, 6, 9, 9, 9, 5, 3, 3, 2, 5, 8, 1, 7, 1, 2, 9, 0, 8, 6, 2, 7, 6, 7, 4, 4, 4, 3, 0
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OFFSET
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0,1
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REFERENCES
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István Mező, The Lambert W Function, Its Generalizations and Applications, CRC Press, 2022.
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LINKS
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FORMULA
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Equals W_1(1), where W_1(x) is the 1-Lambert function.
Equals 1/2 + Sum_{n>=2} (Sum_{k=1..n-1} ((n+k-1)!/(n-1)!) * Stirling2(n-1,k)*(-1/2)^k)/(2^n*n!).
Both formulas are from Mező and Baricz (2017).
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EXAMPLE
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0.40105813754154703565062537500645662909560698650459...
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MATHEMATICA
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RealDigits[x /. FindRoot[Exp[x] == 1/x - 1, {x, 1}, WorkingPrecision -> 120]][[1]]
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PROG
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(PARI) solve(x=0.1, 1, exp(x) - 1/x + 1) \\ Michel Marcus, Apr 02 2022
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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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