For which n $\phi(n) | n$?
46065
How do you find all $n$ such that $\phi(n)|n$
12031
Asymptotic behavior of the sequence $a_n=\sqrt{n+a_{n-1}}$
136623
Hints/ Solution in finding a formula $\phi(n)$ for a binary square matrix
2197
Induction principle for $n!<n^n$
154076
How to show this property of $\mathbb{RP}^{n}$.
46741
Prove that $n$ divides $\phi(a^n -1)$ where $a, n$ are positive integer without using concepts of abstract algebra
47790
If $x \geq 2$ prove that $\sum_{ n \leq x} \frac{1}{\phi(n)} = \mathcal{O}(\log(x))$
39073
Proving that: $\forall n \in \mathbb{N} :|f^{(n)}(x)|\leq \frac{1}{n+1}$
46147
Proving $(\forall a\in\mathbb{Z^+})(m\in\mathbb{Z^+}\to a^m\equiv a^{m-\phi(m)}\pmod{m})$
52565
Prove that if $d \mid n \in \mathbb{N}$, then $\varphi(d) \mid \varphi(n)$.
91889
Prove $\phi^n = \phi F_n + \text{(another Fibonacci number)}$ using mathematical induction.
53263
Show $\sum\limits_{d|n}\phi(d) = n$.
61858
Is there $\phi(n)=n/6$
45939
For which $n≥2$ does there exist $\sigma\in A_n$ with $|\sigma| > n$
36227
Show continuity or uniform continuity of $\phi: (C([0,1];\Bbb R ),||\cdot||_\infty )\to (\Bbb R, |\cdot | )$
114136
Euler's $\phi(n)$ function and solutions of $\phi(n) = 4294967296=2^{32}$
1760
Limit of the geometric sequence $\{r^n\}$, with $|r| < 1$, is $0$?