What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Project Euler: Problem 8, Find largest product in a large string of numbers
Spot the outlier
Matrix to column conversion
Sum of the Matrix Elements
Permute diagonal and antidiagonal
Expression or variable?
Find files with extension ext in the current directory
Pandigital number n°2 (Inspired by Project Euler 32)
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