Search: id:A139233 Results 1-1 of 1 results found. %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 Search completed in 0.001 seconds