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A159354
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Decimal expansion of 18 - 24*log(2).
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1
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1, 3, 6, 4, 4, 6, 7, 6, 6, 6, 5, 6, 1, 3, 1, 2, 5, 7, 3, 9, 8, 6, 4, 2, 9, 0, 8, 5, 0, 0, 3, 7, 6, 2, 3, 6, 6, 1, 8, 7, 9, 9, 6, 7, 7, 5, 3, 5, 3, 8, 7, 3, 9, 0, 1, 1, 0, 3, 6, 7, 9, 7, 7, 2, 1, 5, 8, 5, 5, 3, 0, 7, 2, 7, 2, 7, 3
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OFFSET
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1,2
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COMMENTS
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The sum of the reciprocals of the nonnegative square pyramidal numbers (A000330).
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LINKS
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FORMULA
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Equals Sum_{k>=1} 1/(n*(n+1)*(2*n+1)/6). - Joerg Arndt, Dec 08 2013
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MATHEMATICA
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Sum[1/Sum[i^2, {i, 1, k}], {k, 1, Infinity}]
RealDigits[18-24*Log[2], 10, 100][[1]] (* G. C. Greubel, Jun 15 2018 *)
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PROG
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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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