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Quantum CyberTeaser: January/February 1999
B254
Short stack. A total of n cards numbered 1 through n is
divided into two stacks. What is the minimum value of n such that at least one
stack will include a pair of cards whose numbers add up to an exact square?


The winners:
 Bob Cordwell (Ellicott City, Maryland)
 Max Bachmutsky (KfarSava, Israel)
 Matthew Wong (Edmonton, Alberta)
 Leonid Borovskiy (Brooklyn, New York)
 Elio Abbondanzieri (Houston, Texas)
 Nick Baxter (Hillsborough, California)
 John Beam (Bellaire, Texas)
 Anastasia Nikitina (Pasadena, California)
 Andrei Cipu (Bucharest, Romania)
 Helio Waldman (Campinas, Brazil)
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