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 A108771 #11 Mar 30 2025 03:14:11
%S A108771 1,12,13,144,156,169,1728,1872,2028,2197,20736,22464,24336,26364,
%T A108771 28561,248832,269568,292032,316368,342732,371293,2985984,3234816,
%U A108771 3504384,3796416,4112784,4455516,4826809,35831808,38817792,42052608,45556992
%N A108771 Numbers of the form (12^i)*(13^j), with i, j >= 0.
%H A108771 Robert Israel, <a href="/A108771/b108771.txt">Table of n, a(n) for n = 1..10000</a>
%F A108771 Sum_{n>=1} 1/a(n) = 13/11. - _Amiram Eldar_, Mar 29 2025
%p A108771 N:= 10^8: # to get all terms <= N
%p A108771 sort([seq(seq(12^i*13^j, j = 0 .. floor(log[13](N/12^i))), i=0..floor(log[12](N)))]); # _Robert Israel_, Jun 16 2019
%t A108771 With[{max = 5*10^7}, Flatten[Table[12^i*13^j, {i, 0, Log[12, max]}, {j, 0, Log[13, max/12^i]}]] // Sort] (* _Amiram Eldar_, Mar 29 2025 *)
%Y A108771 Cf. A107326, A107364, A107462, A107466, A107710, A108056, A107764, A108748, A108761, A108090.
%K A108771 nonn,easy
%O A108771 1,2
%A A108771 Douglas Winston (douglas.winston(AT)srupc.com), Jun 25 2005