Find the sum of the numbers from the segment 5:20 which are coprime to 15.

univerkov | July 4, 2021 | education

1. Number 15 contains prime factors 3 and 5. Therefore, numbers that are not divisible by either 3 or 5. On the segment [5; 20] these are the numbers:

7, 8, 11, 13, 14, 16, 17, 19.

2. The sum of these numbers is:

7 + 8 + 11 + 13 + 14 + 16 + 17 + 19 = 105.

Answer: 105.

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