The number of divisors being less than or equal to twice the square root of a natural number
52157
Prove that $d(n)\leq 2\sqrt{n}$
50781
$(n+1)$th prime $p_{n+1}$ less than or equal to $p_1p_2\dots p_n+1$
152870
Near integers in powers of binomials with radicals
107765
Prove that there exists two roots in $[-1,1]$
103304
Finding the number of solutions to a diophantine equation
90537
Converse of Fermat's Little Theorem.
105110
Why does $\sqrt{n\sqrt{n\sqrt{n \ldots}}} = n$?
49509
A number $n$ has $12$ divisors and $d_{d_4-1} = (d_1+d_2+d_4)d_8$.
36862
A question about proving that there is no greatest common divisor
33705
Is $0$ a natural number?
152754
When is the sum of divisors a perfect square?
144622
Proof: If no prime less than or equal to $\sqrt{n}$ divides $n$, then $n$ is a prime
126471
At least one prime between $\sqrt{n}$ and $n$?
129920
Is there any formula for number of divisors of $a \times b$?
118244
An $n$th root inequality: $\sqrt[n]{n} < 1 + \sqrt{2/n}$
40538
On determinants and common divisors
61324
Finding the "square root" of a permutation