Search: id:A046756
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%I A046756
%S A046756 1,625,6561,117649,4100625,31250000,37515625,73530625,771895089,
%T A046756 1000000000,2147483648,6442450944,10737418240,15032385536,23622320128,
%U A046756 25937424601,27917287424,32212254720,33059881728,36507222016
%N A046756 d(n)^4 divides n.
%e A046756 If n=625, d(n)=Sigma[ 0,n ]=5. Its 4th power is 625 which divides n.
%t A046756 Select[ Range[ 1, 14500000 ], IntegerQ[ #/(DivisorSigma[ 0, # ])^2 ]& 
               ]
%Y A046756 Proper subset of A033950, A046754 and A046755. Relatively prime terms 
               are in the sequence thogether with their products like 73530625 or 
               771895089000000000.
%Y A046756 Cf. A033950.
%Y A046756 Sequence in context: A043352 A046755 A016816 this_sequence A143026 A064781 
               A055868
%Y A046756 Adjacent sequences: A046753 A046754 A046755 this_sequence A046757 A046758 
               A046759
%K A046756 nonn
%O A046756 1,2
%A A046756 Labos E. (labos(AT)ana.sote.hu)
%E A046756 a(6)-a(20) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Nov 30 
               2008

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