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A357054
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Decimal expansion of Sum_{k>=1} (-1)^(k+1)*k/Fibonacci(2*k).
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1
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5, 8, 0, 0, 0, 4, 7, 3, 9, 5, 0, 7, 7, 7, 0, 6, 8, 0, 0, 6, 7, 4, 7, 0, 9, 8, 1, 8, 9, 5, 5, 2, 2, 8, 0, 2, 6, 9, 8, 5, 0, 1, 2, 6, 0, 9, 6, 4, 6, 1, 6, 3, 9, 0, 1, 5, 7, 7, 5, 6, 1, 0, 0, 1, 7, 7, 6, 7, 3, 7, 5, 7, 5, 2, 1, 9, 9, 7, 8, 4, 8, 9, 4, 9, 2, 1, 0, 4, 4, 7, 8, 6, 6, 9, 4, 0, 2, 2, 3, 7, 1, 4, 1, 1, 5
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OFFSET
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0,1
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LINKS
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FORMULA
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Equals Sum_{k>=1} (-1)^(k+1)*k/A001906(k).
Equals (1/sqrt(5)) * Sum_{k>=1} 1/Fibonacci(2*k-1)^2 (Jennings, 1994).
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EXAMPLE
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0.58000473950777068006747098189552280269850126096461...
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MATHEMATICA
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RealDigits[Sum[(-1)^(k+1)*k/Fibonacci[2*k], {k, 1, 300}], 10, 100][[1]]
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PROG
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(PARI) sumalt(k=1, (-1)^(k+1)*k/fibonacci(2*k)) \\ Michel Marcus, Sep 10 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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