Last $2$ digits of $2^{10000}$
139173
To find last two digits of $2^{100}$
37873
Number of zero digits in factorials
116379
What are the last two digits of $2017^{2017}$?
3864
How to find length of digits in an integer?
5037
Find the last two digits of $3^{45}$
149961
Two digit numbers
3514
reversing digits and squaring
61555
Rounding up to next power of 2
72437
Sum of the digits of a perfect square
157954
How many digits does the integer zero have?
853
Write down the sum of sum of  sum of digits of $4444^{4444}$
103711
Finding the first digit of $2015^{2015}$
141111
Equation that can easily be changed to output the digit in 1's, 10's ,100's etc?
51299
How many digits is $99^{99}$ without a calculator?
121960
How many numbers from $1$ to $2^n$ will have $``11"$ as substring in binary representation?
143392
How to calculate the division and remainder of a big number manually
84990
Value of $x=\sum\limits_{n=1}^\infty {\frac{1}{10^n-1}} $ and location of second digit $1$ of $x$