Add them up.
11 13 17 19 23 29 31 37 41
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Prime numbers less than 10 = 2, 3, 5, 7The sum of prime numbers less than 10:= 2 + 3 + 5 + 7= 17
10
7+3
The composite numbers between 1 and 10 are 4, 6, 8, 9, 10. And their sum is 37.
The prime numbers between 10 and 15 are 11 and 13.