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Unsolved Problems
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Demonstrations 1  20 of 78
Seven Touching Cylinders Puzzle
Updated this month
Infinite Magic Elliptic Curves
Plotting Collatz Sequences
Other Formulations of the Collatz Problem
Social Golfer Problem
The Lonely Runner Conjecture
Mrs. Perkins's Quilts
Packing Disks with Consecutive Integer Radii in a Circle
Van der Waerden's Theorem
Unsolved Conjectures about Egyptian Fractions
Congruent Numbers
NoThreeinLine Problem
Correlating the Mertens Function with the Farey Sequence
Visualizing the Thomson Problem
No Repeated Distances
A Canadian Lottery Wheel
PrimeGenerating Recurrence
Iterating the Collatz Map on Real and Complex Numbers
Minimally Squared Rectangles
OrchardPlanting Problem
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