Polynomials with divisors of every degree

We consider polynomials of the form t^n-1 and determine when members of this family have a divisor of every degree in Z[t]. With F(x) defined to be the number of such integers up to x, we prove the existence of two positive constants c_1 and c_2 such that $c_1 x/(log x) \leq F(x) \leq c_2 x/(log x).$

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