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A111929
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Numerator of x(n) = Sum_{k=1..n} ((odd part of k)/(k^2)).
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6
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1, 5, 19, 79, 443, 463, 3481, 14029, 44327, 9067, 103769, 104693, 1405361, 1425953, 7321957, 29332873, 510190361, 515635801, 9993116059, 10039674571, 10217040331, 10301692171, 240663600893, 241109786633, 1222682465581
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OFFSET
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1,2
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COMMENTS
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x(n) = a(n)/A111930(n) does not converge.
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REFERENCES
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G. Pólya and G. Szegő, Problems and Theorems in Analysis I (Springer 1924, reprinted 1972), Part Eight, Chap. 1, Sect. 6, Problem 50.
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LINKS
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Eric Weisstein's World of Mathematics, Odd Part
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MAPLE
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map(numer, ListTools:-PartialSums([seq(1/k/2^padic:-ordp(k, 2), k=1..100)])); # Robert Israel, Dec 28 2017
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MATHEMATICA
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od[k_] := k/2^IntegerExponent[k, 2];
a[n_] := Sum[od[k]/k^2, {k, 1, n}] // Numerator;
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CROSSREFS
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KEYWORD
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nonn,frac
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AUTHOR
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STATUS
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approved
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