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 A288636 Height of power-tower factorization of n. Row lengths of A278028. 16
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS 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 LINKS Michael De Vlieger, Table of n, a(n) for n = 1..65536 MATHEMATICA a[n_] := If[n == 1, 0, 1+a[GCD @@ FactorInteger[n][[All, 2]]]]; Array[a, 100] CROSSREFS Cf. A007916, A089723, A164337, A277562, A277564, A278028. Sequence in context: A180601 A331048 A341593 * A089723 A363741 A305253 Adjacent sequences: A288633 A288634 A288635 * A288637 A288638 A288639 KEYWORD nonn AUTHOR Gus Wiseman, Jun 12 2017 STATUS approved

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Last modified August 3 18:59 EDT 2024. Contains 374899 sequences. (Running on oeis4.)