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 A025658 #14 Jul 09 2025 12:51:15
%S A025658 0,0,1,0,1,2,0,1,2,3,0,1,2,3,0,4,1,2,3,0,4,1,5,2,3,0,4,1,5,2,6,3,0,4,
%T A025658 1,5,2,6,3,0,7,4,1,5,2,6,3,0,7,4,1,8,5,2,6,3,0,7,4,1,8,5,2,9,6,3,0,7,
%U A025658 4,1,8,5,2,9,6,3,10,0,7,4,1,8,5,2,9,6,3,10,0,7,4,11,1,8,5,2,9,6,3,10,0,7,4,11,1
%N A025658 Exponent of 6 (value of j) in n-th number of form 4^i*6^j.
%H A025658 Amiram Eldar, <a href="/A025658/b025658.txt">Table of n, a(n) for n = 1..10000</a>
%H A025658 <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 A025658 a(n) = A122841(A025618(n)). - _Amiram Eldar_, Jul 09 2025
%t A025658 With[{max = 10^10}, IntegerExponent[Sort[Flatten[Table[4^i*6^j, {i, 0, Log[4, max]}, {j, 0, Log[6, max/4^i]}]]], 6]] (* _Amiram Eldar_, Jul 09 2025 *)
%Y A025658 Cf. A025618, A025647, A122841.
%Y A025658 Differs from A025673 at a(2805).
%K A025658 nonn
%O A025658 1,6
%A A025658 _David W. Wilson_