Search: id:A064593
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%I A064593
%S A064593 186076800,3456573120,18924364800,325377803520,2666567816640,
%T A064593 8538872307840,11169839116800
%N A064593 Nonunitary triply perfect numbers: the sum of the nonunitary divisors 
               of n is 3n; i.e. sigma(n) - usigma(n) = 3n.
%Y A064593 Cf. A048146, A064591, A064592, A064594, A064595, A064596.
%Y A064593 Sequence in context: A047738 A079323 A061440 this_sequence A084304 A015368 
               A132205
%Y A064593 Adjacent sequences: A064590 A064591 A064592 this_sequence A064594 A064595 
               A064596
%K A064593 nonn,hard
%O A064593 1,1
%A A064593 Dean Hickerson (dean.hickerson(AT)yahoo.com), Sep 25, 2001
%E A064593 There are no others up to 1.6*10^13, but there are at least 20 larger 
               ones, between 87916260096000 and 19424258892617980729341453189120.

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