Find one million consecutive positive numbers, none of which are prime. Ancient math tells us that prime numbers (2, 3, 5, 7, 11, ...,), which have no factors except for 1 and themselves, go on ...

In last month’s Insights puzzle, I concocted a fanciful story about a culinary delicacy made by grilling the ribs of a long serpent, using a special system of grilling frames. This system was my ...

In this week’s puzzles, decode a party trick that uses dice, and reconstruct a pyramid using oranges ...

Thomas Snyder (aka Dr. Sudoku) is a two-time World Sudoku Champion and five-time US Puzzle Champion, as well as the author of several books of puzzles. His puzzles are hand-crafted, with artistic ...

Here’s an unusual trick with three numbers rather than one. How does the magician figure out which numbers you thought of?