%I A101331
%S A101331 3,5,257,340282366920938463463374607431768211457
%N A101331 Fermat(Mersenne(x)) = 2^(2^(2^x-1))+1
%C A101331 Fermat-Mersenne numbers.
%e A101331 F(M(0))= 3
%e A101331 F(M(1))= 5
%e A101331 F(M(2))= 257
%e A101331 F(M(3))= 340282366920938463463374607431768211457
%o A101331 (PARI) for(x=0,4,print( ( 2^(2^(2^x-1))+1 )))
%Y A101331 Sequence in context: A012817 A087367 A058846 this_sequence A087368 A087670 
               A138584
%Y A101331 Adjacent sequences: A101328 A101329 A101330 this_sequence A101332 A101333 
               A101334
%K A101331 nonn
%O A101331 0,1
%A A101331 Jorge Coveiro (jorgecoveiro(AT)yahoo.com), Dec 24 2004