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1, 2, 3, 4, 4, 6, 6, 8, 9, 8, 8, 12, 8, 12, 12, 16, 12, 18, 12, 16, 18, 16, 20, 24, 16, 16, 27, 24, 20, 24, 20, 32, 24, 24, 24, 36, 24, 24, 24, 32, 30, 36, 30, 32, 36, 40, 44, 48, 36, 32, 36, 32, 45, 54, 32, 48, 36, 40, 52, 48, 52, 40, 54, 64, 32, 48, 40, 48, 60, 48, 66, 72, 66
(list;
graph;
refs;
listen;
history;
text;
internal format)
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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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MATHEMATICA
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g[p_] := g[p] = For[k = p - 1, True, k--, If[PrimeOmega[k] == 2, Return[k]]]; f[n_] := Product[{p, e} = pe; If[p <= 3, p, g[p]]^e, {pe, FactorInteger[n]}]; a[n_] := f[f[n]]; Array[a, 100] (* Amiram Eldar, Feb 04 2020 after Jean-François Alcover at A102440 *)
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CROSSREFS
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KEYWORD
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nonn,mult
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AUTHOR
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STATUS
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approved
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