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 A064703 #4 Mar 31 2012 10:22:53 %S A064703 3,9,63,189,729,729,2187,35721,45927,413343,413343,2657205,3720087, %T A064703 4782969,33480783,100442349,387420489,387420489,1162261467 %N A064703 Smallest lucky number that is the product of n lucky numbers. %e A064703 a(5)=729 because 3^4*9=729, a(6)=729 because 3^6=729. %Y A064703 Cf. A000959, A057616. %K A064703 nonn %O A064703 1,1 %A A064703 _Sascha Kurz_, Oct 13 2001