What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Determine if a Given Number is a Triangle Number
Back to basics 8 - Matrix Diagonals
Stuff the Board
Equal to their cube
Chess ELO rating system
Find my secret number
Longest Collatz Sequence
Magic is simple (for beginners)
Find indices of diagonal elements
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