Number of minimal cyclic codes with given length and dimension
  In this article, we count the quantity of minimal cyclic codes of length $n$ and dimension $k$ over a finite field $\mathbb F_q$, in the case when the prime factors of $n$ satisfy a special condition. This problem is equivalent to count the quantity of irreducible factors of $x^n-1\in \mathbb F_q[x]$ of degree $k$. 
F.E. Brochero Mart\'inez
cs.IT math.IT