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A244645
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Decimal expansion of the sum of the reciprocals of the octagonal numbers (A000567).
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8
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1, 2, 7, 7, 4, 0, 9, 0, 5, 7, 5, 5, 9, 6, 3, 6, 7, 3, 1, 1, 9, 4, 9, 5, 3, 4, 9, 2, 1, 0, 2, 4, 3, 3, 2, 1, 1, 5, 5, 6, 6, 3, 4, 4, 8, 0, 3, 9, 0, 2, 4, 7, 2, 3, 2, 6, 9, 3, 4, 9, 1, 9, 8, 4, 0, 7, 5, 1, 5, 1, 5, 1, 5, 1, 9, 5, 5, 4, 5, 1, 9, 6, 0, 7, 6, 2, 4, 3, 0, 6, 3, 1, 6, 3, 3, 1, 4, 1, 0, 8, 8, 0, 5, 0, 3
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OFFSET
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1,2
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LINKS
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FORMULA
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Equals Sum_{n>=1} 1/(3*n^2 - 2*n).
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EXAMPLE
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1.2774090575596367311949534921024332115566344803902472326934919840751515151955452...
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MATHEMATICA
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RealDigits[ Sum[1/(3n^2 - 2n), {n, 1 , Infinity}], 10, 111][[1]]
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PROG
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(PARI) sumpos(n=1, 1/(3*n^2 - 2*n)) \\ Michel Marcus, Sep 12 2016
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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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