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 A074117 #7 Jan 17 2020 17:22:46 %S A074117 1,27,243,2187,19683,177147,1594323,14348907,129140163,1162261467, %T A074117 10460353203,282429536481,2541865828329,22876792454961, %U A074117 205891132094649,1853020188851841,16677181699666569,150094635296999121,1350851717672992089,12157665459056928801 %N A074117 Smallest n-digit power of 3. %H A074117 Andrew Howroyd, <a href="/A074117/b074117.txt">Table of n, a(n) for n = 1..200</a> %F A074117 a(n) = 3^ceiling((n-1)*log(10)/log(3)). - _Andrew Howroyd_, Jan 16 2020 %Y A074117 Cf. A067488, A074116, A074118. %K A074117 base,nonn %O A074117 1,2 %A A074117 _Amarnath Murthy_, Aug 27 2002 %E A074117 a(1) corrected and terms a(16) and beyond from _Andrew Howroyd_, Jan 16 2020