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 A018857 #13 Jan 29 2017 08:53:00 %S A018857 1,27,3,4782969,59049,6561,729,81,9,10460353203,1162261467,129140163, %T A018857 1350851717672992089,14348907,1594323,16677181699666569,177147, %U A018857 1853020188851841,19683,205891132094649,2187,22876792454961 %N A018857 Smallest power of 3 that begins with n. %H A018857 Seiichi Manyama, <a href="/A018857/b018857.txt">Table of n, a(n) for n = 1..563</a> %F A018857 a(n) = 3^A018858(n). - _Seiichi Manyama_, Jan 29 2017 %F A018857 a(3^n) = 3^n for n >= 0. - _Seiichi Manyama_, Jan 29 2017 %Y A018857 Cf. A018802 (k=2), this sequence (k=3), A018859 (k=4), A018861 (k=5), A018863 (k=6), A018865 (k=7), A018867 (k=8), A018869 (k=9). %K A018857 nonn,base %O A018857 1,2 %A A018857 _David W. Wilson_