Find all values of $n$ such that $\varphi(n) = n/6$.
61858
Is there $\phi(n)=n/6$
42469
Find all groups of order $6$.
103732
Proving that for $n \equiv 0 \pmod{2}$, we get ${n \choose 0} < {n \choose 1} <\ldots< {n \choose n/2-1}<{n\choose n/2}$ etc.
70301
$\sin(n)$ subsequence limits set
124456
Given $x \in \mathbb{R}$ and $N \in \mathbb{N}, N>1,$ find integers $h,k$ with $0 < k \leq N $ that satisfy $\lvert{kx - h\rvert} < 1/N.$
52565
Prove that if $d \mid n \in \mathbb{N}$, then $\varphi(d) \mid \varphi(n)$.
148949
Find the value of $\sum_{k=1}^{n} k \binom {n} {k}$
87666
Find $n$ such that $n/2$ is a square, $n/3$ is a cube, and $n/5$ a fifth power
44111
Find the value of $\sum_{k=1}^{n}k\binom{n}{k}$?
41354
Binomial-coefficients if, k, m, n natural numbers and k \leq n the result of
53745
Euler's $\phi$ function: Find all $n$ such that $\phi(n)=n/3$
151111
How do I show that $\frac{n}{\varphi(n)}=\sum\limits_{d \mid n} \frac{\mu^2(d)}{\varphi(d)}$?
52324
Tight bound for $T(n) = T(n^{1/2}) + 1$
34960
Lower bound for $\phi(n)$: Is $n/5  1$?
47737
Find all the possible values of $(a,b,c,d)$.
2882
Limit points of the set $\{\frac {\varphi(n) }n : n\in \mathbb{N}\}$
90293
How expand Binomial[n, k] for k >= 6?