Archive for August, 2006

BD. Magic Numbers

August 24, 2006 · The Mathcast, math puzzles, numbers

We discuss a neat trick involving powers, mod a pair of primes.

 
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BC. Casting Out Nines

August 17, 2006 · The Mathcast, math puzzles, numbers

How do modern “trap-door” encryption schemes work? Over the next three weeks we'll explain, but to warm up, we talk about the medieval practice of “casting out nines”.

 
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BA. The Ring is Exchanged

August 14, 2006 · The Mathcast, answers, guests, logic

Peter Winkler answers his puzzle set in the Land of Kleptomaniacs, and we chat about Martin Gardner. We'll pose another puzzle next week!

 
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AZ. Another puzzle from Peter Winkler

August 7, 2006 · Favorites, The Mathcast, guests, logic, math puzzles

We answer last week's puzzle and Peter Winkler asks how to send a ring through the land of the kleptomaniacs.

 
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