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%I #2 Mar 30 2012 17:33:49
%S 3,517,257655374294967297
%N Concatenation of next n Fermat numbers A000215.
%C a(4) has 292 digits and is too large to include.
%Y Cf. A000215, A053067, A133013.
%K base,bref,easy,nonn
%O 1,1
%A _Omar E. Pol_, Nov 09 2007