The natural numbers between 15 and 30 are simply all of the integers from 16 to 29.
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The prime numbers between 15 and 30 are: 17, 19, 23 and 29
9
The natural numbers are the counting numbers. Therefore, the natural numbers less than 31 are the numbers from 1 to 30.
It is: 17+19+23+29 = 88
15, 30, 45, 60, 75, 90