These are all prime numbers. They are only evenly divisible by themselves and one.
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31 and 23 are prime numbers.
23, 29, 31, 37
The numbers 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47 are prime.
Answer: (5 & 37), (11 & 31), (13 & 29), (19 & 23)
The prime numbers between 23 and 49 are: 23, 29, 31, 37, 41, 43, 47