Finding all the values of n, such that $ \varphi (n) = 12 $
124220
Using Euler's Totient Function, how do I find all values n such that $\phi(n)=12$?
80744
What is the number of strings at size $n$ that is constructed from ${a,b,c,d}$ and there is an even num of $a$
83058
Finding $\mathrm{Var}(N)$ if $N=\inf\{n\ge1:\sum_{i=1}^nX_i>1\}$ where $X_i$'s are i.i.d Exponential variables
9753
How to solve the equation $\phi(n) = k$?
115258
Find all positive integers $n$ such that $\phi(n)+\sigma(n)=2n$.
149509
What method would you go through to find an $n$ such that $\phi(n)=100$?
151636
Fast way to calculate n! mod m where m is prime?
58663
How to show that if $\phi(n)$ equals to n itself, then n must be 1?
37012
The number of summands $\phi(n)$
21612
How to prove this form of $n$?
114262
Find the cardinality of the following set $S_n=\{(x,y)|x^2+y^2=n, \text{where }x,y,n \in \mathbb Z\text{ and }n\geq0 \}$
101993
The cardinality of a language over a set of variables $V$ with $\#V= κ$
55984
How can I find the answer to $\varphi(2^{400} + 2)$?
49501
Prove that : $(a-b)(a-c)(a-d)(b-c)(b-d)(c-d)$ divisible by $12$
16537
Find all the numbers $n$ such that $\frac{4n-5}{60-12n}$ can't be reduced.
77864
Find $P(12)$ when $P(x)={1\over(x+1)}$, for $x=0,1,2,......11$
21746
How do I show that the sum $(a+\frac12)^n+(b+\frac12)^n$ is an integer for only finitely many $n$?