Determine $\phi(2^{399}+1)$
55984
How can I find the answer to $\varphi(2^{400} + 2)$?
124220
Using Euler's Totient Function, how do I find all values n such that $\phi(n)=12$?
26233
$[K(\zeta_n):K]=\phi(n)$?
37012
The number of summands $\phi(n)$
151100
Determining $\lim_{n\to\infty}\left(n^{\tfrac{1}{n}}-1\right)^n$ with only elementary math
1914
General way to determine $\mathbb{Q}(\gamma) = \mathbb{Q}(\alpha,\beta)$ given $\alpha$ and $\beta$
4530
For which natural numbers are $\phi(n)=2$?
81346
Let $r$ be the smallest positive integer such that $a^r \equiv 1 \bmod{n}$. Prove $r \mid \phi(n)$.
78342
When is $\phi(n)$ a prime number?
49938
Proof of $a^{\phi (n) +1} \equiv a \pmod{\! n} $ Carmichael generalization of Fermat-Euler's theorem.
4512
Is there a direct, elementary proof of $n = \sum_{k|n} \phi(k)$?
117681
For which Natural $n\ge2: \phi(n)=n/2$
46065
How do you find all $n$ such that $\phi(n)|n$
136623
Hints/ Solution in finding a formula $\phi(n)$ for a binary square matrix
37346
If $m, n$ be positive integers, prove that $\phi(mn)=\phi((m,n))\phi([m,n])$, where $(m,n)=$ gcd of $m, n$ and $[m, n]=$ lcm of $m, n$.
15436
Find p and q s.t. $({p-1})^{q-1}+({q-1})^{p-1} \equiv 101 \pmod {pq}$
72406
Last two digits of $2^{1000}$ via Chinese Remainder Theorem?