$2^{947} (\bmod 1373)$
360
Modular exponentiation by hand ($a^b\bmod c$)
138088
Diffie-Hellman key exchange: Why is $(g^{k_1} \bmod n )^{k_2} \bmod n \equiv (g^{k_2} \mod n)^{k_1} \bmod n$
25299
What is the remainder when $2^{1990}$ is divided by $1990$?
140983
$ \tan 1^\circ \cdot \tan 2^\circ \cdot \tan 3^\circ \cdots \tan 89^\circ$
91565
How to efficiently compute $\,25^{37}\pmod{55}$?
80754
A slight modification in Chinese Remainder Theorem
121122
Calculate $2^{5104} \bmod 10$ using mental arithmetic
102444
What is $26^{32}\bmod 12$?
150289
A number with an interesting property. $abcd=a^b c^d$
26301
Prove that $x^3 \equiv x \bmod 6$ for all integers $x$
64592
The last two digits of $9^{9^9}$
47522
group generators of $(\mathbb Z_{17}-\{0\},\times)$
22084
$\mathbb{Z}[i] / (2+3i)$ has 13 elements
32278
Adjoining 1/2 to $\Bbb{Z}/12\Bbb{Z}$
147665
$a_1=3;\ a_{n+1}=3^{a_n}$; find $a_{2004}\bmod100$
12760
The last 2 digits of $7^{7^{7^7}}$
58803
${n \choose k} \bmod m$ using Chinese remainder theorem?