2, 3, 5, and 7
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The prime numbers that are less than 22 are 2, 3, 7, 11, 13, 17, 19.
The prime numbers less than 30 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29This is a total of ten numbers.
All of these numbers are prime numbers that are less than thirty: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 = 129
The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.