35
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43 (the other 3 are divisible by 3)
x+27=43 x+27-27=43-27 x+0=16
These numbers are cubes of the numbers 1,2,3,5 & 6, respectively. So 43 is missing, which is 64. It should go between 27 and 125.
16 plus 27 equals 43.
447