\nthroot{16}{y^{52}}

\nthroot{3}{7^{12}}

\nthroot{7}{3^{22}}

\nthroot{8}{7^{24}}

\nthroot{10}{7^{55}}

\nthroot{15}{y^{76}}

\nthroot{20}{7^{32}}

\nthroot{3}{x^{13}}

\nthroot{6}{3^{31}}

\nthroot{11}{x^{34}}

\nthroot{19}{y^{40}}

\nthroot{18}{7^{46}}

\nthroot{3}{7^{5}}

\nthroot{18}{3^{93}}

\nthroot{4}{3^{23}}

\nthroot{12}{x^{47}}

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

\nthroot{15}{y^{21}}

\nthroot{10}{y^{38}}

\nthroot{17}{7^{60}}

\nthroot{12}{3^{31}}

\nthroot{9}{7^{47}}

\nthroot{14}{7^{21}}

\nthroot{12}{x^{47}}