- Optimization in Number `cyclotomic_polynomial(n,x)`.
- Optimization in Number `cyclotomic_polynomial(n,x)`.

It now generates only the squarefree divisors of n and keeps track of the number of prime factors of each squarefree divisor. This helps when `n` has many divisors.

trizen/sidef,trizen/sidef,trizen/sidef,trizen/sidef