31 is a Prime number. Its only prime factor is 31.
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There are five prime numbers: 31, 37, 41, 43, and 47.
There are 6 prime numbers between 31 and 60, or 7 if 31 is included.
211,141 is not a prime. 31 is a prime.
31 is the only prime factor of 31.
31,37,41,43,47