Phi is 8 has only 5 solutions
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Theorem
$\phi$ denotes the Euler $\phi$-function.
There are $5$ numbers $n$ with the property that $\map \phi n = 8$, and they are $15$, $16$, $20$, $24$ and $30$.
Proof
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Source
- user180834 (https://math.stackexchange.com/users/180834/), Euler's function $\phi$: Values such that $\phi(n)=8$, $\phi(n)=14$, URL (version: ): https://math.stackexchange.com/q/1126844