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
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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.