Does $n|\phi(m^n-1)$?
46741
Prove that $n$ divides $\phi(a^n -1)$ where $a, n$ are positive integer without using concepts of abstract algebra
104982
Determine $\phi(2^{399}+1)$
17178
Order of $\phi(g)$ divides the order of $g$
15000
Show that number of elements in $(Z/nZ)^*$ is $\phi (n)$
84930
How to justify $\phi(n) \ge \sqrt{n}$
46971
Number of surjections from $\{1,...,m\}$ to $\{1,...,n\}$
94558
Show that $\phi(mn) = \phi(m)\phi(n)\frac{d}{\phi(d)}$
82448
Why is $f(x) = x\phi(x)$ one-to-one?
125188
how to prove $m^{\phi(n)}+n^{\phi(m)}\equiv 1 \pmod{mn}$ where m and n are relatively prime?
144819
Proving $P(n) =n^{\phi(n)} \prod\limits_{d \mid n} \left(\frac{d!}{d^d} \right)^{\mu(n/d)}$
53745
Euler's $\phi$ function: Find all $n$ such that $\phi(n)=n/3$
135808
Show that there is a positive integer $n$ such that $G \cong \ker(\phi^{n}) \times \phi^{n}(G)$
12976
Prove $\displaystyle\lim_{n\to\infty}\phi(n)=\infty$.
54376
Convergence of the series $\sqrt[n]n-1$
34491
Is there a way to show that $\sqrt{p_{n}} < n$?
115258
Find all positive integers $n$ such that $\phi(n)+\sigma(n)=2n$.
102406
Why is it not true that if $\Phi \models \exists x \phi$ then there is a term $t$ with $\Phi \models \phi \frac{t}{x}$?