Finding positive integer(s) $n$ for which $3^{n-1} + 5^{n-1} | 3^{n} + 5^{n}$: Is my solution correct?
30620
For which natural n is $3^n+5^n$ divisible by $3^{n-1}+5^{n-1}$?
91451
find all positive integer $m,n$
112120
Find all primes of the form $2^{2^n} + 5$ for a nonnegative integer n
89758
Is there a formula for $(1+i)^n+(1-i)^n$?
83634
Find $\lim_{n\to \infty}\sqrt[n]{3^n+5^n}$
100558
Prove that for any even positive integer $n$, $n^2-1 \mid 2^{n!}-1$
52542
For which odd positive integer $n$ , is it true that $-1$ is not a positive power of $2$ modulo $n$?
33866
Show that $n$ does not divide $2^n - 1$ where $n$ is an integer greater than $1$?
19500
How can I find $\gcd(a^m+1,a^n+1)$ with $a,m,n$ positive integers?
63661
integers $n$ such that $(n-1)!+1$ is a power of $n$
26461
Integer solutions of $x^3-x+9=5y^2$
148906
Finding integers $m,n$ such that $(m-n)^2=4mn/(m+n-1)$
122156
An inequality concerning three positive numbers
21906
Show $3^m + 3^n +1$ cannot be a perfect square for $m,n$ being positive integers.
4077
Using induction prove $n^3-n$ is divisible by 3 whenever n is a positive number.
17491
Proof by Induction: Solving $1+3+5+\cdots+(2n-1)$
8446
Number of solutions over positive integers of $x_1 + x_2 + ... + x_n = S$ for $x_i \in [0, 25]$