\nthroot{16}{x^{65}}

\nthroot{15}{3^{79}}

\nthroot{9}{3^{39}}

\nthroot{17}{7^{74}}

\nthroot{17}{x^{30}}

\nthroot{4}{y^{11}}

\nthroot{8}{x^{39}}

\nthroot{19}{x^{23}}

\nthroot{20}{y^{51}}

\nthroot{4}{y^{22}}

\nthroot{13}{7^{22}}

\nthroot{15}{7^{20}}

\nthroot{6}{7^{17}}

\nthroot{13}{7^{70}}

\nthroot{14}{3^{41}}

\nthroot{12}{y^{26}}

\nthroot{12}{y^{50}}

\nthroot{15}{y^{61}}

\nthroot{17}{7^{79}}

\nthroot{19}{7^{36}}

\nthroot{7}{x^{37}}

\nthroot{18}{3^{102}}

\nthroot{6}{y^{24}}

\nthroot{19}{3^{42}}