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%I #12 Dec 19 2016 12:02:16
%S 1,2,2,4,2,6,2,8,8,6,2,12,2,6,6,16,2,18,2,12,6,6,2,18,8,6,4,12,2,30,2,
%T 8,6,6,6,36,2,6,6,40,2,30,2,12,40,6,2,48,8,18,6,12,2,12,6,40,6,6,2,60,
%U 2,6,40,64,6,30,2,12,6,30,2,72,2,6,40,12,6,30
%N Smallest number with equivalent prime tower factorization as n.
%C A279686 defines the prime tower factorization equivalence classes.
%C This sequence is to A279686 what A046523 is to A025487.
%C a(a(n))=a(n) for any n>0.
%C a(n)=n iff n belongs to A279686.
%H Rémy Sigrist, <a href="/A279690/b279690.txt">Table of n, a(n) for n = 1..10000</a>
%H Rémy Sigrist, <a href="/A279690/a279690.pdf">Prime tower factorization of the first terms</a>
%H Rémy Sigrist, <a href="/A279690/a279690.gp.txt">PARI program for A279690</a>
%Y Cf. A279686, A025487, A046523.
%K nonn
%O 1,2
%A _Rémy Sigrist_, Dec 17 2016
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