31 and 47 are prime.
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31 and 47 are prime, the rest composite.
The numbers 29, 31, 37, 41, 43 and 47 are prime.
All of them except for 31, 37, 41, 43 and 47 which are prime numbers.
The prime numbers from 31 to 80 are 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, and 79.
37, 41, 43, 47