%I #2 Mar 30 2012 19:00:16
%S 1,14,148,1489,148916,14891625,1489162527,148916252732,14891625273236,
%T 1489162527323649,148916252732364964,14891625273236496472,
%U 1489162527323649647281,1489162527323649647281100
%N Concatenation of the first n powerful numbers A001694.
%K nonn,base
%O 1,2
%A _Jaroslav Krizek_, Jul 19 2009