Question

What is the sum of the seven smallest composite numbers which cannot be determined to be composite simply by using the divisibility rules for 2, 3, 4, 5, 6, 8, 9, 10? (THE ANSWER IS NOT 4+6+8+9+10+12+14)

Answer 1

My answer is 247.

Explanation:

I used guess and check, but if you can find a better way please let me know.

32 + 33+34+35+36+38+39=247=13x19.

I hope it can help!

Answer 2

the sum was 29 percent each