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The answer depends on where, within the sequence, the missing number should have been.
They are 24 and 15 which are composite numbers
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.
64 It is a series of cubes 13, 23, 33, 43, 53 etc
It is a prime number and its factors are 43 and 1