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 A228104 #15 Mar 30 2025 03:14:36
%S A228104 6,18,24,54,72,96,162,216,288,384,486,648,864,1152,1458,1536,1944,
%T A228104 2592,3456,4374,4608,5832,6144,7776,10368,13122,13824,17496,18432,
%U A228104 23328,24576,31104,39366,41472,52488,55296,69984,73728,93312,98304,118098,124416,157464,165888
%N A228104 Numbers of form 2^(2i-1)*3^j, with i,j > 0.
%H A228104 Robert Israel, <a href="/A228104/b228104.txt">Table of n, a(n) for n = 1..10000</a>
%F A228104 Sum_{n>=1} 1/a(n) = 1/3. - _Amiram Eldar_, Mar 29 2025
%p A228104 N:= 10^6: # for terms <= N
%p A228104 sort([seq(seq(2^i * 3^j, j = 1 .. ilog[3](N/2^i)),i=1..ilog2(N/3),2)]); # _Robert Israel_, Oct 14 2024
%t A228104 With[{max = 2*10^5}, Flatten[Table[2^(2*i-1)*3^j, {i, 1, (Log2[max]+1)/2}, {j, 1, Log[3, max/2^(2*i-1)]}]] // Sort] (* _Amiram Eldar_, Mar 29 2025 *)
%o A228104 (PARI) vecsort(vector(10000,n,2^(2*((n-1)%100)+1)*3^((n\100)+1))) /* (first 100 values) */
%Y A228104 Subsequence of A033845 and A011775.
%K A228104 nonn,easy
%O A228104 1,1
%A A228104 _Ralf Stephan_, Aug 10 2013