\nthroot{3}{y^{17}}

\nthroot{17}{x^{23}}

\nthroot{15}{x^{47}}

\nthroot{12}{7^{47}}

\nthroot{13}{3^{51}}

\nthroot{12}{y^{27}}

\nthroot{7}{y^{17}}

\nthroot{12}{x^{21}}

\nthroot{20}{y^{94}}

\nthroot{16}{3^{31}}

\nthroot{14}{7^{27}}

\nthroot{15}{x^{75}}

\nthroot{9}{7^{53}}

\nthroot{8}{3^{20}}

\nthroot{10}{y^{16}}

\nthroot{6}{3^{14}}

\nthroot{4}{x^{7}}

\nthroot{8}{3^{42}}

\nthroot{20}{3^{43}}

\nthroot{6}{y^{11}}

\nthroot{5}{y^{27}}

\nthroot{4}{7^{23}}

\nthroot{20}{y^{68}}

\nthroot{20}{x^{106}}