39 is not a Prime number.
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5, 19, 29, 61
29 is prime but 39 is composite
The prime factors of 30 are 2, 3, and 5. The prime factor of 31 is 31. The prime factors of 32 are 2, 2, 2, 2, and 2. The prime factors of 33 are 3 and 11. The prime factors of 34 are 2 and 17. The prime factors of 35 are 5 and 7. The prime factors of 36 are 2, 2, 3, and 3. The prime factor of 37 is 37. The prime factors of 38 are 2 and 19. So, the number must be 30, which is 2 x 3 x 5.
13 is a prime number and 39 isint a prime number
30 has factors of 2,3 and 5