Specifies how many digits in a given integer.
Example: in=100 ==> out=3
Add tests with 100,1000...
Solutions with ceil are wrong.
How to find the position of an element in a vector without using the find function
Sum all integers from 1 to 2^n
Project Euler: Problem 5, Smallest multiple
Project Euler: Problem 8, Find largest product in a large string of numbers
Matrix to column conversion
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