What is the least residue of 49^4 modulo 23
360
Modular exponentiation by hand ($a^b\bmod c$)
35821
Infinitely many primes for quadratic residues
95653
Euler's theorem: [3]^2014^2014 mod 98
37417
Why is $ 561 = 3*11*17 $ the smallest Carmichael number?
134377
The minimum number of digits after the floating-point, which uniquely identify every irrational square root
96816
The residue at $\infty$
99243
What is the remainder when $24^{1202}$ is divided by $1446$?
4475
Find the remainder when $2^{2016}$ is divided by $47$
40779
What is the smallest possible value of $\lfloor (a+b+c)/d\rfloor+\lfloor (a+b+d)/c\rfloor+\lfloor (a+d+c)/b\rfloor+\lfloor (d+b+c)/a\rfloor$?
28957
Verifying that $2^{44}-1$ is divisible by $89$
101349
$-1$ isn't a quadratic residue $\pmod{p}, p=4k+3$.
6160
How to prove a number $a$ is quadratic residue modulo $n$?
136918
How to determine the smallest numbers with $n$ factors
32653
Smallest integer divisible by all up to $n$
34095
Calculating residue of pole of order $2$
55049
How to find the inverse modulo $m$?
5037
Find the last two digits of $3^{45}$