\nthroot{16}{7^{88}}

\nthroot{5}{y^{28}}

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

\nthroot{6}{7^{20}}

\nthroot{8}{7^{47}}

\nthroot{20}{y^{25}}

\nthroot{14}{3^{16}}

\nthroot{7}{x^{9}}

\nthroot{19}{x^{105}}

\nthroot{16}{x^{18}}

\nthroot{4}{x^{13}}

\nthroot{18}{7^{102}}

\nthroot{16}{x^{61}}

\nthroot{15}{y^{24}}

\nthroot{8}{7^{43}}

\nthroot{19}{y^{106}}

\nthroot{16}{3^{30}}

\nthroot{9}{7^{13}}

\nthroot{11}{7^{63}}

\nthroot{18}{7^{63}}

\nthroot{20}{y^{47}}

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

\nthroot{18}{3^{60}}

\nthroot{6}{3^{33}}