For 21: 3,7
For 51: 3,17
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The factors of 39 are 1, 3, 13, and 39. Its prime factors are 3 x 13. The factors of 51 are 1, 3, 17, and 51. Its prime factors are 3 x 17.
The factors of 34 are: 1, 2, 17, and 34.The prime factors of 34 are: 2 and 17.The factors of 51 are: 1, 3, 17, and 51.The prime factors of 51 are: 3 and 17.
The prime factors of 51 are 3 and 17.
357 is not a prime number. Its positive integer factors are: 1, 3, 7, 17, 21, 51, 119, 357
No, it is not a prime number. It has factors of: 1, 3, 17, 51.