The factors of 21 are:
1, 3, 7, 21
The factors of 53 are:
1, 53
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Its factors are itself and one because 53 is a prime number
The only factors of 53 are 1 and 53. That's what makes it prime.
factors: 1, 3, 5, 7, 13, 15, 21, 35, 39, 65, 91, 105, 195, 273, 455, 1365prime factors: 3, 5, 7, 13
(1, 105) (3, 35) (5, 21) (7, 15)
The factors of 15 are: 1, 3, 5, and 15.The prime factors of 15 are: 3 and 5.The factors of 21 are: 1, 3, 7, and 21.The prime factors of 21 are: 3 and 7.