>>262
最小多項式は
P_1(x) = x -1,
P_2(x) = x^2 -2x -1,
P_3(x) = x^6 -6x^5 +9x^4 -2x^3 +9x^2 -60x +50,
P_n(x) = P(x-a) P(x-aω) P(x-aω^2) …… P(x-aω^{n-1}),
 ただし P(x) = P_{n-1}(x), a=n^(1/n), ω = exp(2πi/n).