The set of prime numbers less than 20 = {2, 3, 5, 7, 11, 13, 17,19}
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They are 239 prime numbers less than 1500.
2, 3 and 5 are prime numbers that are less than 7
the greatest prime numbers that is less than 100 = 97
There are 1229 prime numbers that are less than 10000.
There are 25 prime numbers less than 100