2,3, and 5.
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There are not three prime numbers that have the sum of 3. The smallest prime number is 2. If all three prime numbers were 2, the sum would 2 + 2 + 2 = 6, so that is the smallest number that is the sum of three prime numbers.
The first three prime numbers are 2,3,5. The smallest number divisible by 2,3 and 5 is 30 (2*3*5).
the answer is 120 because the first three prime numbers are 2,3,5 and the first three composite numbers are 4,6,8.
154, 308, 462
The sum of the five smallest prime numbers is 18.