2, 3, 5, 7, 11, 13, 17, 19.
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All the prime numbers less than 20 are 2,3,5,7,11,13,17,19
23 and 29 are the two prime numbers greater than 20 but less than 30.
The set of prime numbers less than 20 = {2, 3, 5, 7, 11, 13, 17,19}
2,3,5,7,11,13,17,19
There are actually 8 prime numbers less than 20: 2, 3, 5, 7, 11, 13, 17, and 19