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160
Is this number a prime?
codegolf.stackexchange.com
53
(-a) × (-a) = a × a
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15
How many cubes can we fit in?
puzzling.stackexchange.com
14
An unusual and very hard number sequence problem
puzzling.stackexchange.com
13
15 Balls Sorting
puzzling.stackexchange.com
12
Find the Highest number of apples
puzzling.stackexchange.com
6
Create a 5x5 Modulo Grid
puzzling.stackexchange.com
5
Infinite wizards and hats
puzzling.stackexchange.com
5
Checker-board Problems
puzzling.stackexchange.com
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