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%I #5 Mar 30 2012 17:33:49
%S 3,35,3517,3517257,351725765537,3517257655374294967297,
%T 351725765537429496729718446744073709551617,
%U 351725765537429496729718446744073709551617340282366920938463463374607431768211457
%N Concatenation of first n Fermat numbers.
%Y Cf. A007908, A019434, A019518. Fermat numbers: A000215.
%K easy,nonn,base
%O 1,1
%A _Omar E. Pol_, Oct 16 2007
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