13 is a prime number, 4 is a factor of 20, 3 is a prime number and a factor of 21, 30 is a multiple of 6, 17 is a prime number, 8 is a factor of 24, 5 is a prime number and a factor of 35, 42 is a multiple of 7, 19 is a prime number, 9 is a factor of 36

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