If every Prime-Divisor of m is a prime-Divisor of n ist, then φ(mn) = mφ(n)
33144
Criterion for $\phi(mn)=m\phi(n)$ to be true
68221
Question regardles primes and the fundamental theorem of arithmetic
26233
$[K(\zeta_n):K]=\phi(n)$?
5841
Proving prime $p$ divides $\binom{p}{k}$ for $k\in\{1,\ldots,p-1\}$
24988
Prove there exists $m > 2010$ such that $f(m)$ is not prime
116361
Relationship between prime factorizations of $n$ and $n+1$?
156859
Proving that $GF(p^n)$ contains a unique subfield isomorphic to $GF(p^m)$ if and only if $m$ is a divisor of $n$.
144622
Proof: If no prime less than or equal to $\sqrt{n}$ divides $n$, then $n$ is a prime
121723
$\phi(n)=\frac{n}{2}$ if and only if $n=2^k$ for some positive integer k
60804
About the property of $m$: if $n < m$ is co-prime to $m$, then $n$ is prime
15348
prime divisor of $3n+2$ proof
15000
Show that number of elements in $(Z/nZ)^*$ is $\phi (n)$
78342
When is $\phi(n)$ a prime number?
92737
primes whose difference is a multiple of $n$
114404
For which positive integer values of $n$ does $a|mn-b?$
2264
Conjecture: the sequence of sums of all consecutive primes contains an infinite number of primes
100515
Prove that if $d$ divides $n$ then $φ(d)$ divide $φ(n)$ for $φ$ denotes Euler’s φ-function.