%I A153800
%S A153800 2,3,5,7,13,19,25,41,110,192
%N A153800 Indices of multiply-perfect numbers that are also perfect numbers.
%e A153800 a(7) is 25 because the 25th multiply-perfect number A007691(25)=137438691328 
               is also the 7th perfect number A000396(7).
%Y A153800 cF. A000396, A007691.
%Y A153800 Sequence in context: A038917 A134266 A062252 this_sequence A147791 A072467 
               A062326
%Y A153800 Adjacent sequences: A153797 A153798 A153799 this_sequence A153801 A153802 
               A153803
%K A153800 more,nonn
%O A153800 1,1
%A A153800 Omar E. Pol (info(AT)polprimos.com), Jan 13 2009