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 A118502 #10 Aug 20 2021 04:22:03
%S A118502 1,7,14,21,66,205,583,837,1259,1631,2178,6346,15851,58371,61804,
%T A118502 129196,409879,1670753
%N A118502 Numbers k that divide floor((4/3)^k).
%C A118502 Next term after 409879 is greater than 10^6.
%e A118502 floor((4/3)^21) = 420 and 420 is divisible by 21, so 21 is in the sequence.
%t A118502 t = 1; Do[t = 4t/3; If[Mod[Floor[t], n] == 0, Print[n]], {n, 10^6}]
%Y A118502 Cf. A073633.
%K A118502 nonn,more
%O A118502 1,2
%A A118502 _Ryan Propper_, May 06 2006
%E A118502 a(18) from _Ryan Propper_, Jul 21 2006