Math Magic is a web site devoted to
original mathematical recreations. If you have a math puzzle, discovery, or observation, please e-mail me about it. You can also send answers to the problem of the month. |

Math Magic Archive |

What are the shortest pairs of flash cards that evaluate to n in one order, and n+1 in the other order? What are the 3 shortest flash cards that have different cyclical orders to evaluate to n, n+1, and n+2?

For pairs A and B of flash cards, is it possible that the 4 orders AA, AB, BA, and BB evaluate to 4 consecutive integers? Is this sort of thing possible with larger numbers of flash cards?

You can see all the best known results here.

Submit your answers here.

Weekly Puzzle Sites: | | Ken Duisenberg | NPR | Puzzability | The Griddle | Puzzle Picnic | Nick's | |

Other Puzzle Sites: | | MathPuzzle.com | IBM | Retrograde Analysis | Puzzle Palace | Terry Stickels | |

Interactive Puzzle Sites: | | Click Mazes | Puzzle Beast | Logic Mazes | Color Shift | Grid 1 | 2 | Boomshine | |

Physics-Based Puzzle Sites: | |
Perfect Balance 1 |
2 |
Assembler 1 |
2 |
3 |
4 | | Color Infection | Redstar Fall 1 | 2 | Fantastic Contraption | |

Colleges with Puzzles: | | Macalester | Missouri State | Purdue | |

Great Math Sites: | | Geometry Junkyard |
Math World |
Mathematician Biographies |
| Integer Sequences | Inverse Calculator | Geometric Dissections | |

Recreational Math Sites: | | Mike Keith |
Harvey Heinz |
Primes |
GIMPS |
| Polyforms | World of Numbers | Soup Kitchen | |