I am not sure about popular but the most used ones would probably be pi, e, 1, 2 and 10.
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There are 2 prime numbers between 30 and 40: 31 and 37.
The prime numbers between 17 and 30 inclusive are: 17 19 23 29
23 and 29 are the only two numbers that fall between 21 and 30
The natural numbers between 15 and 30 are simply all of the integers from 16 to 29.
The composite numbers between 20 and 30 are: 20 21 22 24 25 26 27 28 30