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A068114
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Integers of the form phi(n!)/phi(n)!.
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0
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1, 4, 96, 384, 34560, 4147200, 23224320, 6220800, 99532800, 1605264998400, 10319560704000, 52973744947200, 2517312359890944000, 137731736862720000, 104125193068216320000, 1039086126666344300544000000
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Table[EulerPhi[n!]/EulerPhi[n]!, {n, 50}], IntegerQ] //DeleteDuplicates (* Harvey P. Dale, Sep 09 2017 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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