What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Find the alphabetic word product
Counting in Finnish
Vectorizing, too easy or too hard?
Find the biggest empty box
Sophie Germain prime
Numbers spiral diagonals
Can you beat the lottery again (for hardcore coder) ?
Numbers spiral diagonals (Part 1)
Chess ELO rating system
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