What is this digit operation?
0 -> 0
1 -> 9
121 -> 9
44 -> 6
15 -> 5
1243 -> 7
Magic is simple (for beginners)
Let's get back to school, and create multiplication tables
Numbers spiral diagonals (Part 2)
BLOCK x3 (Version 3)
BLOCK x3 (Version 4)
Clear all empty variables from the workspace
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