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A080400
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Largest squarefree number dividing phi(n).
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6
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1, 1, 2, 2, 2, 2, 6, 2, 6, 2, 10, 2, 6, 6, 2, 2, 2, 6, 6, 2, 6, 10, 22, 2, 10, 6, 6, 6, 14, 2, 30, 2, 10, 2, 6, 6, 6, 6, 6, 2, 10, 6, 42, 10, 6, 22, 46, 2, 42, 10, 2, 6, 26, 6, 10, 6, 6, 14, 58, 2, 30, 30, 6, 2, 6, 10, 66, 2, 22, 6, 70, 6, 6, 6, 10, 6, 30, 6, 78, 2, 6, 10, 82, 6, 2, 42, 14, 10, 22
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OFFSET
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1,3
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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Table[Max[Select[Divisors[EulerPhi[n]], SquareFreeQ]], {n, 90}] (* Harvey P. Dale, Jul 05 2012 *)
a[n_] := Times @@ FactorInteger[EulerPhi[n]][[;; , 1]]; Array[a, 100] (* Amiram Eldar, Jun 18 2022 *)
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PROG
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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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