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On the solutions of the congruence
Authors:Florian Luca  Michal Krizek
Institution:Mathematical Institute, Academy of Sciences, Zitná 25, 115 67 Praha 1, Czech Republic ; Mathematical Institute, Academy of Sciences, Zitná 25, 115 67 Praha 1, Czech Republic
Abstract:

In this note, we show that if $n$ is a positive integer satisfying the congruence $n^{2}\equiv 1~ (mod~\phi ^{2}(n))$, then $n\le 3$.

Keywords:
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