$\varphi(n) \mid n$

Number theory
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Tolaso J Kos
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$\varphi(n) \mid n$

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Post by Tolaso J Kos »

In association with this post let us see the following exercise:

Find all $n \in \mathbb{N}$ such that $\varphi(n) \mid n$.
Imagination is much more important than knowledge.
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