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 A025641 #17 Jan 19 2021 21:25:22
%S A025641 0,1,0,2,1,3,0,2,4,1,3,0,5,2,4,1,6,3,0,5,2,7,4,1,6,3,8,0,5,2,7,4,9,1,
%T A025641 6,3,8,0,5,10,2,7,4,9,1,6,11,3,8,0,5,10,2,7,12,4,9,1,6,11,3,8,13,0,5,
%U A025641 10,2,7,12,4,9,14,1,6,11,3,8,13,0,5,10,15,2,7,12,4,9,14,1,6,11,16,3,8,13,0,5,10
%N A025641 Exponent of 3 (value of i) in n-th number of form 3^i*6^j.
%C A025641 Also known as (exponent of 3 in n-th number of the form 3^i * 6^j) - (exponent of 2 in n-th number of the form 3^i * 6^j). - _David A. Corneth_, Jan 12 2021
%H A025641 David A. Corneth, <a href="/A025641/b025641.txt">Table of n, a(n) for n = 1..10000</a>
%e A025641 a(5) = 1 as the 5th number of the form 3^i * 6^j is 18 = 3^1 * 6^1 which has exponent of 3 equal to 1. - _David A. Corneth_, Jan 12 2021
%t A025641 SortBy[Join @@ Table[{i, 3^i*6^j}, {i, 0, Log[3, #]}, {j, 0, Log[6, #/3^i]}], Last] &[10^8][[All, 1]] (* _Michael De Vlieger_, Jan 12 2021, after _Amiram Eldar_ at A025614 *)
%Y A025641 Differs from A025649 at a(114). A025657 is exponent of 6.
%Y A025641 Cf. A025614.
%K A025641 nonn
%O A025641 1,4
%A A025641 _David W. Wilson_