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 A025493 #8 Mar 30 2012 18:35:25 %S A025493 1,6,9,27,177147 %N A025493 Smallest k that converges after exactly n iterations of the Kempner function A002034. %C A025493 The next term, a(6) = 3^88563, is too large to include. %Y A025493 Cf. A002034, A018194, A025492. %K A025493 nonn %O A025493 1,2 %A A025493 _David W. Wilson_