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 A141668 a(n) = tau(n) * (NumberOfPartitions(n) - 1). 1
 0, 0, 2, 4, 12, 12, 40, 28, 84, 87, 164, 110, 456, 200, 536, 700, 1150, 592, 2304, 978, 3756, 3164, 4004, 2508, 12592, 5871, 9740, 12036, 22302, 9128, 44824 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Table of n, a(n) for n = 0..5000 FORMULA a(n) = A000005(n)*(A000041(n) - 1) = A000005(n)*A000065(n). MATHEMATICA f[n_] = DivisorSigma[0, n]*PartitionsP[n] - DivisorSigma[0, n]; Table[f[n], {n, 1, 30}] PROG (PARI) a(n) = if (n, numdiv(n)*(numbpart(n)-1), 0); \\ Michel Marcus, Jun 11 2018 CROSSREFS Cf. A000005, A000041. Sequence in context: A000348 A168342 A309515 * A087796 A268494 A306851 Adjacent sequences:  A141665 A141666 A141667 * A141669 A141670 A141671 KEYWORD nonn AUTHOR Roger L. Bagula and Gary W. Adamson, Sep 06 2008 STATUS approved

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Last modified September 22 11:29 EDT 2020. Contains 337289 sequences. (Running on oeis4.)