%I A161324
%S A161324 1,2,6,12,576000
%N A161324 Let b(n,k) = the kth binary digit (starting at k=1, reading right to 
               left) in the base 2 representation of n. (So: n = sum{k>=0} b(k+1)*2^k.) 
               A positive integer n is included in this sequence if and only if 
               n = product{k>=1} k^b(n,k).
%C A161324 Hans Havermann found term a(5). Jack Brennen says that there are no other 
               terms < 2^32.
%e A161324 12 in binary is 1100. And 12 = 4^1 * 3^1 * 2^0 * 1^0. So, 12 is in the 
               sequence.
%Y A161324 Sequence in context: A126293 A007668 A089415 this_sequence A116534 A130533 
               A082722
%Y A161324 Adjacent sequences: A161321 A161322 A161323 this_sequence A161325 A161326 
               A161327
%K A161324 base,more,nonn
%O A161324 1,2
%A A161324 Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jun 07 2009