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An entertaining blend of arithmetic and graphics lets us display the successive terms of an arithmetic sequence visually. This calls for some explanation—and decoding!
By playing with letters, digits and numbers, we can build sequences whose "stop" and "restart" rules reveal surprising arithmetic phenomena. It would take a clever mind indeed to fathom the jumps between successive terms!
The world of magic squares is still very much alive and remains an active field of research. Access to computing power has rekindled enthusiasts’ interest in these arithmetical objects. What happens if we try to define a multiplicative form of magic?
Many arithmetic problems can be solved using standard methods, whether elementary or advanced. But some puzzles call for a basic concept—divisibility—and a little ingenuity.
