0
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26 less than 21 is negative 5
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26 - 21 = 5 or 24 - 23 = 1
Composite numbers greater than 20 and less than 30 are 21, 22, 24, 25, 26, 27, 28.
13 + 16 + 18 + 20 + 21 + 26 + 27 + 27 + 28 + 36 + 39 + 42 + 43 = 356