Search: id:A135937
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%I A135937
%S A135937 1,2,6,168,6623019333730800000
%N A135937 a(1)=1. For n>=2, a(n) = product{d|a(n-1)} (d+1), where the product is 
               over all positive divisors d of a(n-1).
%C A135937 The next term is a lot bigger than 70000! and is too large to include. 
               - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Dec 31 
               2007
%H A135937 Leroy Quet, <a href="http://www.prism-of-spirals.net/">Home Page</a> 
               (listed in lieu of email address)
%e A135937 The positive divisors of a(3)=6 are 1,2,3,6. So a(4) = (1+1)*(2+1)*(3+1)*(6+1) 
               = 2*3*4*7 = 168.
%t A135937 a = {1}; Do[AppendTo[a, Times @@ (Divisors[a[[ -1]]] + 1)], {4}]; a - 
               Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Dec 31 
               2007
%Y A135937 Cf. A135938.
%Y A135937 Sequence in context: A088430 A051240 A003189 this_sequence A137532 A072116 
               A055696
%Y A135937 Adjacent sequences: A135934 A135935 A135936 this_sequence A135938 A135939 
               A135940
%K A135937 nonn
%O A135937 1,2
%A A135937 Leroy Quet Dec 07 2007
%E A135937 a(5) from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Dec 
               31 2007

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