Search: id:A090052
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%I A090052
%S A090052 1,32,48,64,96,128,144,160,192,256,288,320,384,432,448,480,512,576,
%T A090052 640,648,672,704,720,768,800,832,864,896,960,1024,1088,1152,1216,
%U A090052 1248,1280,1296,1344,1408,1440,1458,1536,1600,1664,1728,1792,1920
%N A090052 Group-abundant numbers: n such that the number of groups of order n (A000001) 
               exceeds n.
%C A090052 It seems fairly certain that 1 is the only group-perfect number and that 
               almost all numbers are group-deficient. However, all that is known 
               at present is that all square-free numbers are group-deficient.
%Y A090052 Cf. A000001.
%Y A090052 Sequence in context: A114416 A046304 A114447 this_sequence A163285 A036329 
               A014614
%Y A090052 Adjacent sequences: A090049 A090050 A090051 this_sequence A090053 A090054 
               A090055
%K A090052 nonn
%O A090052 1,2
%A A090052 John Conway (conway(AT)Math.Princeton.EDU), Jan 21 2004

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