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A288636
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Height of power-tower factorization of n. Row lengths of A278028.
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13
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0, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1
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OFFSET
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1,4
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COMMENTS
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After a(1)=0 this sequence has many terms equal to A089723. It first differs at a(64)=2, A089723(64)=4.
First positions of a(n) = {0, 1, 2, 3, 4} are n = {1, 2, 4, 16, 65536}. - Michael De Vlieger, Nov 24 2017
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LINKS
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Michael De Vlieger, Table of n, a(n) for n = 1..65536
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MATHEMATICA
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a[n_] := If[n == 1, 0, 1+a[GCD @@ FactorInteger[n][[All, 2]]]];
Array[a, 100]
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CROSSREFS
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Cf. A007916, A089723, A164337, A277562, A277564, A278028.
Sequence in context: A180601 A331048 A341593 * A089723 A305253 A294336
Adjacent sequences: A288633 A288634 A288635 * A288637 A288638 A288639
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KEYWORD
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nonn
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AUTHOR
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Gus Wiseman, Jun 12 2017
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STATUS
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approved
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