The factors of 57 are 1, 3, 19, 57.
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72.
Their common factors are 1 and 3.
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42 72
The numbers are: 12 and 72
No, neither 27 nor 57 are prime numbers.
57
The lowest common multiple of 9 and 8 is 72.