Using Euler's Totient Function, how do I find all values n such that $\phi(n)=12$?
9753
How to solve the equation $\phi(n) = k$?
55984
How can I find the answer to $\varphi(2^{400} + 2)$?
109343
Solve Euler Project #9 only mathematically - Pythagorean triplet
33144
Criterion for $\phi(mn)=m\phi(n)$ to be true
48655
Find all n such that : $3 \mid (n2^{n}+1)$
5868
Find the real number $x$ represented by continued fraction $[12;2,2,12,2,2,12,2,2,12\dots]$
109440
How does $(12\dots n)$ and $(a\, b)$ generate $S_n$?
144928
Find all primes $p$ such that $\phi(x)=x^{13}$ is a homomorphism $\Bbb Z/p\Bbb Z \rightarrow \Bbb Z/p\Bbb Z$.
81723
Infinitely many primes proof using Euler's totient
147275
Finding a Eulerian Tour
88662
$n$ divides $\phi(a^n -1)$ where $a, n$ are positive integer.
82448
Why is $f(x) = x\phi(x)$ one-to-one?
21746
How do I show that the sum $(a+\frac12)^n+(b+\frac12)^n$ is an integer for only finitely many $n$?
97900
Project Euler - 34 / Find a mathematical approach for upper bound
145835
Closed form for CRT solution using Euler $\phi\,$ (totient)
46065
How do you find all $n$ such that $\phi(n)|n$
45127
Why is Euler's totient function equal to $(p-1)(q-1)$ when $N=pq$ and $p$ and $q$ are prime in a clean intuitive way?