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169
Is this number a prime?
codegolf.stackexchange.com
55
(-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
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13
15 Balls Sorting
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12
Find the Highest number of apples
puzzling.stackexchange.com
6
Create a 5x5 Modulo Grid
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5
Infinite wizards and hats
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5
Minimum steps on a numberline
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5
Checker-board Problems
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