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Concatenation of the first n powerful numbers A001694.
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%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