i got this problem in book *foudations of algorithm:*
Rules: start from number 1, you can
 (1) mutiple it by 2  for any time
 (2) divide it by 3 for any time
Example: 13=1*2*2*2*2/3*2*2*2/3 .
Question:
is there a nature number n that cannot be produced following the above
rules?

it seems negative to me,but  don't know how to proof. maybe somebody would
be interested enough to help


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