Search: id:A138815
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%I A138815
%S A138815 1,2,4,8,16,32,64,128,256,512,1024,2048,8191,16382,32764,65528,131056,
%T A138815 262112,524224,1048448,2096896,4193792,8387584,16775168
%N A138815 Divisors of 16775168 (the 5th perfect number divided by 2).
%C A138815 The n-th perfect number divided by 2 (A133028(n)) has 2*A090748(n) divisors, 
               then this sequence has 24 members. First 12 members are the first 
               12 powers of 2 A000079. Last 12 members are multiples of 5th Mersenne 
               prime A000668(5)=8191. a(n) written in base 2 has n digits. See A138825 
               for the structure of this sequence.
%Y A138815 Perfect number divided by 2: A133028. Cf. A000043, A000079, A000396, 
               A000668, A090748, A134708, A135655, A138825.
%Y A138815 Sequence in context: A000079 A120617 A050732 this_sequence A103662 A023423 
               A079838
%Y A138815 Adjacent sequences: A138812 A138813 A138814 this_sequence A138816 A138817 
               A138818
%K A138815 easy,fini,full,nonn
%O A138815 1,2
%A A138815 Omar E. Pol (info(AT)polprimos.com), Mar 31 2008

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