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 A025647 #16 Jul 09 2025 12:52:12
%S A025647 0,1,0,2,1,0,3,2,1,0,4,3,2,1,5,0,4,3,2,6,1,5,0,4,3,7,2,6,1,5,0,4,8,3,
%T A025647 7,2,6,1,5,9,0,4,8,3,7,2,6,10,1,5,9,0,4,8,3,7,11,2,6,10,1,5,9,0,4,8,
%U A025647 12,3,7,11,2,6,10,1,5,9,0,13,4,8,12,3,7,11,2,6,10,1,14,5,9,0,13,4,8,12,3,7,11,2
%N A025647 Exponent of 4 (value of i) in n-th number of form 4^i*6^j.
%H A025647 Amiram Eldar, <a href="/A025647/b025647.txt">Table of n, a(n) for n = 1..10000</a>
%H A025647 <a href="/index/Se#sequences_which_agree_for_a_long_time">Index entries for sequences which agree for a long time but are different</a>.
%F A025647 a(n) = A235127(A025618(n)/6^A025658(n)). - _Amiram Eldar_, Jul 09 2025
%t A025647 With[{max = 10^10}, SortBy[Flatten[Table[{i, j}, {i, 0, Log[4, max]}, {j, 0, Log[6, max/4^i]}], 1], 4^#[[1]] * 6^#[[2]] &][[;; , 1]]] (* _Amiram Eldar_, Jul 09 2025 *)
%Y A025647 Cf. A025618, A025658, A235127.
%Y A025647 Differs from A025653 at a(2805).
%K A025647 nonn
%O A025647 1,4
%A A025647 _David W. Wilson_