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Unsolved Problems
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Demonstrations 1  20 of 85
Biggest Little Polyhedron
New this month
Chromatic Spindles
Discrepancy Conjecture
3D UnitDistance Graphs
EarthMoon Problem
Pentagon Tilings
Seven Touching Cylinders Puzzle
Visualizing the Collatz Conjecture and Some Variants
Iterating the Collatz Map on Real and Complex Numbers
Wheel Graphs with Integer Edges
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
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