Column

  1. Math

    Divisibility by Seven

    An ingenious, recently developed method tests if a number is divisible by 7.

    By Ivars Peterson
  2. Math

    Coins in a Row

    A simple game involving coins in a row has unexpected complexities.

    By Ivars Peterson
  3. Math

    Coins in a Row

    A simple game involving coins in a row has unexpected complexities.

    By Ivars Peterson
  4. Math

    Works in Progress

    Studying math in school doesn't often give you a sense of what mathematical research is about.

    By Ivars Peterson
  5. Math

    Classroom Birthdays

    What's the probability of finding matching birthdays in a small group?

    By Ivars Peterson
  6. Math

    Captcha the Puzzle

    A computer creates a test that it can't pass but most people can.

    By Ivars Peterson
  7. Math

    Sosa’s Corked Bat

    Does Sammy Sosa's hitting reveal a corked-bat effect?

    By Ivars Peterson
  8. Math

    Sea Shell Spirals

    The golden ratio doesn't figure into the spiral structure of the chambered nautilus shell.

    By Ivars Peterson
  9. Math

    Fibonacci’s Other Numbers

    Arrays of whole numbers can give intriguing sums.

    By Ivars Peterson
  10. Math

    Primal Surge

    The Great Internet Mersenne Prime Search has netted its eighth champion.

    By Ivars Peterson
  11. Math

    Super Bowl Crashes

    Should you stay off the road immediately after the Super Bowl telecast is over?

    By Ivars Peterson
  12. Math

    Super Bowl Crashes

    Should you stay off the road immediately after the Super Bowl telecast is over?

    By Ivars Peterson