The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 (list; graph; refs; listen; history; text; internal format)
 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. LINKS Rémy Sigrist, Table of n, a(n) for n = 1..10000 Rémy Sigrist, Prime tower factorization of the first terms Rémy Sigrist, PARI program for A279690 CROSSREFS Cf. A279686, A025487, A046523. Sequence in context: A307088 A143112 A286472 * A167272 A090624 A304407 Adjacent sequences:  A279687 A279688 A279689 * A279691 A279692 A279693 KEYWORD nonn AUTHOR Rémy Sigrist, Dec 17 2016 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 28 13:42 EST 2021. Contains 349412 sequences. (Running on oeis4.)