It is: 51 because it has more than two factors and so therefore it is a composite number
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17, 23 and 31 are prime. 39 is not.
17, 23 and 31 are prime. 39 is not.
The two prime numbers immediately following 17 are 19 and 23.
3, 13, 17, 23 are prime numbers. The others are not.
23 is a prime number only divisable by 1 and 23.