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Those polynomials are irreducible in $\Z[X]$$\mathbb Z[X]$ and have different degree... see http://en.wikipedia.org/wiki/Cyclotomic_polynomial
Those polynomials are irreducible in $\Z[X]$ and have different degree... see http://en.wikipedia.org/wiki/Cyclotomic_polynomial
Those polynomials are irreducible in $\mathbb Z[X]$ and have different degree... see http://en.wikipedia.org/wiki/Cyclotomic_polynomial
