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%I #3 Mar 11 2014 01:34:10
%S 6,628,628496,6284968128,628496812833550336,
%T 6284968128335503368589869056,
%U 6284968128335503368589869056137438691328,62849681283355033685898690561374386913282305843008139952128
%N Concatenation of first n perfect numbers.
%H Omar E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica de los numeros primos y perfectos</a>.
%Y Perfect numbers: A000396. Cf. A007908, A019518, A078795.
%K easy,nonn,base
%O 1,1
%A _Omar E. Pol_, Sep 05 2007