There's also this:
3 6 9
3+6+9=18, 8+1=9
6+6+6+6+9+9+3=39, 3+9=12, 1+2=3
No matter how you add 3, 6, and 9 in a fractal calculation, these numbers always return to themselves)
Added 1 minute later
Guess who else knows this)))
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