The prime numbers:
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97
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All prime numbers have only two factors. 2, 3, 5, 7, 11
A prime number has exactly two factors: itself and 1.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
prime numbers
Prime numbers like 2, 3, 5 and 7.