%I #10 Sep 26 2020 03:53:00

%S 1,6,9,36,54,81,216,324,486,729,1296,1944,2916,4374,6561,7776,11664,

%T 17496,26244,39366,46656,59049,69984,104976,157464,236196,279936,

%U 354294,419904,531441,629856,944784,1417176,1679616,2125764,2519424,3188646

%N Numbers of form 6^i*9^j, with i, j >= 0.

%H Amiram Eldar, <a href="/A025628/b025628.txt">Table of n, a(n) for n = 1..10000</a>

%F Sum_{n>=1} 1/a(n) = (6*9)/((6-1)*(9-1)) = 27/20. - _Amiram Eldar_, Sep 26 2020

%F a(n) ~ exp(sqrt(2*log(6)*log(9)*n)) / sqrt(54). - _Vaclav Kotesovec_, Sep 26 2020

%t n = 10^6; Flatten[Table[6^i*9^j, {i, 0, Log[6, n]}, {j, 0, Log[9, n/6^i]}]] // Sort (* _Amiram Eldar_, Sep 26 2020 *)

%Y Subsequence of A025614.

%K easy,nonn

%O 1,2

%A _David W. Wilson_