This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A279690 #12 Dec 19 2016 12:02:16 %S A279690 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 A279690 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 A279690 2,6,40,64,6,30,2,12,6,30,2,72,2,6,40,12,6,30 %N A279690 Smallest number with equivalent prime tower factorization as n. %C A279690 A279686 defines the prime tower factorization equivalence classes. %C A279690 This sequence is to A279686 what A046523 is to A025487. %C A279690 a(a(n))=a(n) for any n>0. %C A279690 a(n)=n iff n belongs to A279686. %H A279690 Rémy Sigrist, <a href="/A279690/b279690.txt">Table of n, a(n) for n = 1..10000</a> %H A279690 Rémy Sigrist, <a href="/A279690/a279690.pdf">Prime tower factorization of the first terms</a> %H A279690 Rémy Sigrist, <a href="/A279690/a279690.gp.txt">PARI program for A279690</a> %Y A279690 Cf. A279686, A025487, A046523. %K A279690 nonn %O A279690 1,2 %A A279690 _Rémy Sigrist_, Dec 17 2016