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 A084797 #9 Jul 01 2025 19:25:41 %S A084797 1,2,3,22,5,32,7,222,33,52,11,322,13,72,53,2222,17,332,19,522,73,211, %T A084797 23,3222,55,213,333,722,29,532,31,22222,311,217,75,3322,37,219,313, %U A084797 5222,41,732,43,2211,533,232,47,32222,77,552,317,2213,53,3332,511,7222 %N A084797 Greatest number formed by concatenating prime factors of n in base 10. %H A084797 Alois P. Heinz, <a href="/A084797/b084797.txt">Table of n, a(n) for n = 1..20000</a> %p A084797 with(combinat): %p A084797 a:= n-> `if`(n=1, 1, max(map(x-> parse(cat(x[])), %p A084797 permute([seq(i[1]$i[2], i=ifactors(n)[2])]))[])): %p A084797 seq(a(n), n=1..100); # _Alois P. Heinz_, May 02 2016 %Y A084797 Different from A084796. Cf. A073646. %K A084797 nonn,look,base %O A084797 1,2 %A A084797 _N. J. A. Sloane_, Jul 19 2003 %E A084797 More terms from _Alois P. Heinz_, May 02 2016