Find the last digit of $22^{23^{24^{25^{26^{27^{28^{\cdot^{\cdot^{\cdot^{67}}}}}}}}}}$
360
Modular exponentiation by hand ($a^b\bmod c$)
23726
A closed form for $1^{2}-2^{2}+3^{2}-4^{2}+ \cdots + (-1)^{n-1}n^{2}$
103711
Finding the first digit of $2015^{2015}$
4475
Find the remainder when $2^{2016}$ is divided by $47$
108238
Find the smallest integer $n$ greater than $1$ such that the last $3$ digits of $n^2$ are the same as the last $3$ digits of $n$.
71047
Sum the digits of a number
28661
What will be the one's digit of the remainder in: $\left|5555^{2222} + 2222^{5555}\right|\div 7=?$
39373
How can I calculate $24^{33} \bmod 80$
49626
Find the last two digits of $33^{100}$
51161
Finding the inverse of 84 mod 5
43113
Whether the given number is divisible by 24?
64592
The last two digits of $9^{9^9}$
60385
How to solve this sequence $165,195,255,285,345,x$
42391
Calculate $\tan9^{\circ}-\tan27^{\circ}-\tan63^{\circ}+\tan81^{\circ}$
46400
how do i prove that $17^n-12^n-24^n+19^n \equiv 0 \pmod{35}$
72406
Last two digits of $2^{1000}$ via Chinese Remainder Theorem?
70492
What is the shortest way to compute the last 3 digits of $17^{256}$?