31 and 41 are prime numbers because they have only two factors
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21.
There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.
These are the composites between 31 and 41: 32, 33, 34, 35, 36, 38, 39, 40.
1, 11, 21, 31, 41. 1 is not a prime number.
87 is a composite number while 31, 59 and 41 are prime numbers.