Determine if a Given Number is a Triangle Number
So many choices
Rotate a Matrix by 90 degrees
Replace multiples of 5 with NaN
Largest Prime Number
Lights Out 12 - 5x5, three stages, <7 moves
Rule of mixtures (composites) - either bound
Inscribed Pentagon? 2
Lights Out 4 - 5x5, 8 moves
Mechanical Advantage of a Gear Train
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