%I A139231
%S A139231 4,24,96,8064,122880,393216,2146959360
%N A139231 First differences of Mersenne primes A000668.
%H A139231 O. E. Pol, <a href="http://www.polprimos.com">Determinacion geometrica 
               de los numeros primos y perfectos"</a>.
%F A139231 a(n) = A000668(n+1) - A000668(n).
%e A139231 a(1)=4 because A000668(1)=3 and A000668(2)=7 then 7-3 = 4.
%Y A139231 Cf. A000668, A139228, A139229, A139230, A139232, A139233, A139234, A139235, 
               A139236, A139237.
%Y A139231 Sequence in context: A119920 A100738 A139238 this_sequence A052462 A048806 
               A043009
%Y A139231 Adjacent sequences: A139228 A139229 A139230 this_sequence A139232 A139233 
               A139234
%K A139231 nonn
%O A139231 1,1
%A A139231 Omar E. Pol (info(AT)polprimos.com), Apr 18 2008