17, 31 and 23 are.
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The numbers 17, 19, 23, 29, 31 and 37 are prime.
The prime numbers between 1 and 31 (inclusive) are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, and 31.
The numbers 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 are prime (including the boundaries).
13 17 19 23 29 31.
They are: 17 19 23 29 31 37.