1,3,5,9,15,45
1,3,9,27,81
3 and 5 are prime.
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The only prime factor of 81 is: 3.The prime factors of 225 are: 3 and 5.
The prime factors of 81 are 3x3x3x3 (or 34 in expontial form). The prime factors of 108 are 2x2x3x3x3 (or 22 x 33 in exponential form).
45 has two prime factors: 3 and 5.
The product of its prime factors are: 3*3*3*3 = 81
The factors of 45 are 1,3,5,9 and 15 those are the factors of 45.