Compute the unit digit of ${{43}^{43}}^{43}$
49116
Finding the last digit of $103^{103^{103^{103^{103}}}}$
45456
Do the digits of $\pi$ contain every possible finite-length digit sequence?
123482
How to compute $\mathbb{Z}_n^*$, the unit group of the integers modulo $n$?
30496
Casting nines and elevens in other bases (radix) and doing check sums for binary
4475
Find the remainder when $2^{2016}$ is divided by $47$
137787
Is it possible to invoke the OEIS from Mathematica?
103493
Find the $1000$th digit after the decimal point of $\sqrt{n},$ where $n=\underbrace{11\dots1}_{1998 \text{ 1's}}$
110722
$n$ and $n^5$ have the same units digit?
104970
How to dequantify units in mathematica?
42462
Use a linear approximation to estimate the number $64.07^{2/3}$
67312
How to find the last digit of $3^{1000}$?
107848
Finding the remainder of $\overbrace{11\ldots1}^{123 \text{ times}}$ divided by $271$
79343
How to compute the nth root of a very big integer
13186
Approximating cos(43) with error less than $8/60000$
102368
How to calculate last four digits of $2^{2017}$?
49967
Find the last two digits of $ 7^{81} ?$
51680
decimal representation of $2^m$ starts with a particular finite sequence of decimal digits