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

 

Logo


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.

License Agreements, Terms of Use, Privacy Policy. .

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