What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Add two numbers
Find the longest sequence of 1's in a binary sequence.
Find nearest prime number less than input number
Magic is simple (for beginners)
Longest Collatz Sequence
Rank of magic square (for beginners)
Numbers spiral diagonals (Part 1)
Find indices of diagonal elements
Find my secret number
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