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Anonymous
20 = 2 x 2 x 5
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3*17 = 51
23*29=667
The prime factors are: 2 x 2 x 5
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
The prime numbers less than 20 are 2, 3, 5, 7, 11, 13, 17, and 19.