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A323982
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Decimal expansion of cosh(Pi/6).
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8
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1, 1, 4, 0, 2, 3, 8, 3, 2, 1, 0, 7, 6, 4, 2, 8, 7, 9, 2, 1, 4, 1, 1, 3, 1, 9, 8, 0, 3, 7, 9, 3, 5, 0, 8, 9, 0, 7, 6, 6, 8, 9, 7, 6, 6, 7, 5, 1, 1, 3, 2, 0, 5, 5, 0, 5, 7, 7, 5, 0, 9, 9, 6, 9, 6, 0, 1, 2, 1, 3, 3, 1, 6, 0, 0, 3, 4, 9, 0, 3, 6, 8, 5, 1, 3, 2, 3, 4, 2, 1, 6, 0, 8, 8, 8, 2, 7, 8, 8, 7, 3, 8, 8, 1, 3, 3, 5, 6, 1, 7, 7
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OFFSET
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1,3
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COMMENTS
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Decimal expansion of sum sigma_1 involved in calculation of i^i. [Uhler]
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LINKS
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FORMULA
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EXAMPLE
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1.1402383210764287921411319803793508907668976675113205505775099696012133160034...
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MATHEMATICA
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a[0] = a[1] = 1; a[n_] := ((n - 2)^2 + 1) a[n - 2]; t[x_] := N[(1/2)^x*a[x]/x!, 128]; RealDigits[ Sum[ t[x], {x, 0, 421, 2}], 10, 111][[1]] (* Robert G. Wilson v, Feb 16 2019 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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