MathSciNet bibliographic data MR1823899 11A07 (11A25 11D09) Luca, Florian; Křížek, Michal On the solutions of the congruence $n^2\equiv1\pmod{\phi^2(n)}$$n^2\equiv1\pmod{\phi^2(n)}$. Proc. Amer. Math. Soc. 129 (2001), no. 8, 2191–2196. Article

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