find the last 4 dgits of $2^{2016}$
4972
Mod of numbers with large exponents [modular order reduction]
142038
Finding the number of elements of order two in the symmetric group $S_4$
17390
Find $LK_1^2 + LK_2^2 + \dots + LK_{11}^2$.
17766
Find $n^{th}$ term of $\frac23,\frac35,\frac58,\frac8{13}\dots$
95217
Find The Last 3 digits of the number $2003^{2002^{2001}}$
80327
Last digits, numbers
113237
Find the sum of the roots of the floor equation
154735
$so(4)=su(2)× su(2)$
55984
How can I find the answer to $\varphi(2^{400} + 2)$?
60385
How to solve this sequence $165,195,255,285,345,x$
52083
Vandermonde determinant for order 4
70460
How can I solve the following sequence
72223
Last non Zero digit of a Factorial
113550
Help finding the limit of this series $\frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \frac{1}{32} + \cdots$
23726
A closed form for $1^{2}-2^{2}+3^{2}-4^{2}+ \cdots + (-1)^{n-1}n^{2}$
25299
What is the remainder when $2^{1990}$ is divided by $1990$?
141183
How to determine highest power of $2$ in $3^{1024}-1$?