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169
Is this number a prime?
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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
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6
Create a 5x5 Modulo Grid
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5
Infinite wizards and hats
puzzling.stackexchange.com
5
Minimum steps on a numberline
puzzling.stackexchange.com
5
Checker-board Problems
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