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A349620
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Dirichlet convolution of A003415 with the Dirichlet inverse of A003958.
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5
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0, 1, 1, 3, 1, 2, 1, 8, 4, 2, 1, 5, 1, 2, 2, 20, 1, 7, 1, 5, 2, 2, 1, 12, 6, 2, 15, 5, 1, 3, 1, 48, 2, 2, 2, 17, 1, 2, 2, 12, 1, 3, 1, 5, 7, 2, 1, 28, 8, 11, 2, 5, 1, 24, 2, 12, 2, 2, 1, 7, 1, 2, 7, 112, 2, 3, 1, 5, 2, 3, 1, 40, 1, 2, 11, 5, 2, 3, 1, 28, 54, 2, 1, 7, 2, 2, 2, 12, 1, 10, 2, 5, 2, 2, 2, 64, 1, 15
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OFFSET
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1,4
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LINKS
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FORMULA
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MATHEMATICA
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f[p_, e_] := e/p; d[1] = 0; d[n_] := n*Plus @@ f @@@ FactorInteger[n]; a[n_] := DivisorSum[n, MoebiusMu[#] * EulerPhi[#] * d[n/#] &]; Array[a, 100] (* Amiram Eldar, Nov 25 2021 *)
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PROG
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(PARI)
A003415(n) = if(n<=1, 0, my(f=factor(n)); n*sum(i=1, #f~, f[i, 2]/f[i, 1]));
A097945(n) = (moebius(n)*eulerphi(n)); \\ Also Dirichlet inverse of A003958.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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