Prime numbers are any numbers with 2factors exactly, 1, and themselves. Those are: 2,3,5, and 7. 1 is not considered prime because it has only 1 factor.
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23 and 29
The prime numbers between 43 and 53 are 47 and 53.
2,4,6,8,10,12,14,15,16,18,20,21
prime numbers between 12 and18: 13, & 17