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 A074118 #4 Dec 05 2013 19:55:33
%S A074118 1,9,81,729,6561,59049,531441,4782969,43046721,387420489,3486784401,
%T A074118 94143178827,847288609443,7625597484987,68630377364883,
%U A074118 617673396283947,5559060566555523,50031545098999707,450283905890997363
%N A074118 Largest power of 3 <= 10^n.
%C A074118 a(n)=3^d(n), with d(0)=0 and d(n)=A054965(n) if n>0. [_Zak Seidov_, Oct 01 2010]
%t A074118 Table[3^Floor@Log[3, 10^n],{n,0,20}] (*_Zak Seidov_, Sep 29 2010*)
%Y A074118 Cf. A067488, A074116, A074117, A175852.
%K A074118 nonn
%O A074118 0,2
%A A074118 _Amarnath Murthy_, Aug 27 2002
%E A074118 a(0)=1 and more terms from _Zak Seidov_, Sep 29 2010