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COOL MATH: Sand Piles
OPENING PUZZLER Stack \(n\) coins at the origin on the number line and let them spread across it according to the following rule: Identify a stack with two or more coins on it and then “fire” that...
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COOL MATH: Very Triangular Numbers
This essay starts with a puzzle I posed on twitter, which led to a next puzzle, and a next. My thanks to @republicofmath and @sted304A for computing very very triangular numbers, and to @daveinstpaul...
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