147
49,3
7,7,3
3 x 7^2
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82 the 2 is the exponent
You look at the exponents. x5y2 and x3y4 The greatest common factor of these is the largest exponent of each. So the greatest common factor is: x3y2
13 is already prime. It doesn't need a rainbow.
120 60,2 30,2,2 15,2,2,2 5,3,2,2,2
Prime factors in exponents: 25*52 = 800