%I A139233
%S A139233 223,3582,16767288,4261388256
%N A139233 Second differences of perfect numbers A000396, divided by 2.
%F A139233 a(n) = A139230(n)/2.
%Y A139233 Cf. A000396, A139228, A139229, A139230, A139231, A139232, A139234, A139235, 
               A139236, A139237.
%Y A139233 Sequence in context: A108819 A158226 A152834 this_sequence A153165 A094491 
               A162604
%Y A139233 Adjacent sequences: A139230 A139231 A139232 this_sequence A139234 A139235 
               A139236
%K A139233 nonn
%O A139233 1,1
%A A139233 Omar E. Pol (info(AT)polprimos.com), Apr 19 2008