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A166140
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Product of the nonzero elements of the n-th row of A166139.
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3
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1, 2, 3, 2, 5, 6, 7, 2, 3, 10, 11, 6, 13, 14, 15, 2, 17, 6, 19, 10, 21, 22, 23, 6, 5, 26, 3, 14, 29, 900, 31, 2, 33, 34, 35, 6, 37, 38, 39, 10, 41, 1764, 43, 22, 15, 46, 47, 6, 7, 10, 51, 26, 53, 6, 55, 14, 57, 58, 59, 900, 61, 62, 21, 2, 65, 4356, 67, 34, 69, 4900, 71, 6, 73, 74, 15
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OFFSET
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1,2
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COMMENTS
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LINKS
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MAPLE
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A080305 := proc(n) if numtheory[mobius](n) < 0 then n; else 1; end if; end proc:
A126988 := proc(n, k) if n mod k = 0 then n/k ; else 0; end if; end proc:
A166140 := proc(n) a := 1 ; for k from 1 to n do if n mod k = 0 then a := a* A166139(n, k) ; end if; end do: a ; end proc:
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MATHEMATICA
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A080305[n_]:= If[MoebiusMu[n]<0, n, 1];
A126988[n_, k_]:=If[Mod[n, k]==0, n/k, 0];
A166140[n_]:= (p=1; For[k=1, k<n, k++, If[Mod[n, k]==0, p*=A166139[n, k]]]; p)
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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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