The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.
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2,3,5,7,9,11,13,17,19
There are 35 prime numbers less than 150.
There are 15 prime numbers less than 50
There are 27 prime numbers less than 102.
There are 25 prime numbers less than 100
There are no negative prime numbers.