181 is prime. Its only factors are one and itself.
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13 is a prime factor of itself Prime factors of 30 are: 2, 3 and 5
13 is a prime number so the only factors are 1 and itself.
13 is the largest prime factor of 3120.
There are three prime factors of 273. They are 3, 7, and 13.
1, because 13 is prime. * * * * * Correct answer, wrong reason. Although 13 is prime, the GCF of 13 and 26, for example, is 13. What matters is that the numbers are co-prime, nit that one of them is prime.