%I A046801
%S A046801 0,1,2,2,4,2,6,2,8,4,8,4,24,2,8,8,16,2,32,2,48,12,16,4,96,8,8,8,64,8,96,
%T A046801 2,32,16,8,16,512,4,8,16,192,4,144,8,128,64,16,8,768,4,128,32,128,8,
%U A046801 160,64,256,16,64,4,4608,2,8,96,128,8,384,4,128,16,512,8,8192,8,32,128
%N A046801 Number of divisors of 2^n-1.
%H A046801 T. D. Noe, <a href="b046801.txt">Table of n, a(n) for n=0..500</a> (using 
               data from A001265)
%F A046801 a[ n ] = DivisorSigma [ 0, 2^n -1 ] ]
%e A046801 a[ 120 ]=72728 since 2^120-1 has that many divisors.
%Y A046801 Cf. A000225.
%Y A046801 Sequence in context: A071364 A067824 A107067 this_sequence A137502 A143112 
               A167272
%Y A046801 Adjacent sequences: A046798 A046799 A046800 this_sequence A046802 A046803 
               A046804
%K A046801 nonn
%O A046801 0,3
%A A046801 Labos E. (labos(AT)ana.sote.hu)