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A279690
Smallest number with equivalent prime tower factorization as n.
4
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, 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, 2, 6, 40, 64, 6, 30, 2, 12, 6, 30, 2, 72, 2, 6, 40, 12, 6, 30
OFFSET
1,2
COMMENTS
A279686 defines the prime tower factorization equivalence classes.
This sequence is to A279686 what A046523 is to A025487.
a(a(n))=a(n) for any n>0.
a(n)=n iff n belongs to A279686.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémy Sigrist, Dec 17 2016
STATUS
approved