Add them up.
30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60
The sum is 75.
39
452
What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27
173, excluding the two end-points.
Their sum is 37.
The sum is 75.
39
452
What is the sum of the composite numbers less than 10?4 + 6 + 8 + 9 = 27
The composite numbers between 1 and 10 are 4, 6, 8, 9, 10. And their sum is 37.
3665, excluding 25 and 100.
173, excluding the two end-points.
The sum of 5 composite numbers can be either composite, or prime, depending on the case.
50
The sum of these composite numbers, including 100, is 3989.The sum of all numbers between 1 and 100 is 5,050. From this we need to subtract the sum of 1 plus all the prime numbers below 100. The sum of the primes is 1,060. Subtracting (1 + 1060) or 1,061 from 5,050 yields 3,989.
26