The question cannot be answered in a sensible way because its assertion is FALSE!
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The prime numbers from 1 to 18 are 2, 3, 5, 7, 11, 13, and 17.
2+5+11= 18.
2, 5 and 11
The prime numbers between 1 and 18 are: 2 3 5 7 11 13 17.
2, 5 and 11.