13 is a Prime number so the only factors are 1 and itself.
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13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
181 is prime. Its only factors are one and itself.
There are three prime factors of 273. They are 3, 7, and 13.
The Prime Factor of 81 is 3The Prime Factors of 28 are 2, 7
The factors of 91 are: 1 7 13 91 The prime factors are: 7 and 13