1 and 3
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The factors of 21 are: 1, 3, 7, 21 The factors of 51 are: 1, 3, 17, 51
Factors of 51: 1, 3, 17, and 51 3 and 17 are prime.
The factors of 51 are: 1, 3, 17, 51The factors of 57 are: 1, 3, 19, 57
1, 3, 17, 51
The factors of 51 are: 1, 3, 17, 51The factors of 69 are: 1, 3, 23, 69