What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Which values occur exactly three times?
Find the peak 3n+1 sequence value
Sorted highest to lowest?
Is A the inverse of B?
BLOCK x3 (Version 3)
Magic is simple (for beginners)
Numbers spiral diagonals (Part 2)
How many monitors are connected ?
BLOCK x3 (Version 4)
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