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  • Thanks John, I didn't know about these problems, and now you've made (ruined?) my evening. It's worth it though.

    April 8, 2009

  • “Let’s call the smallest possible number that doubles its value when its last digit is moved to the front, the “Dyson number�? for 2. The Dyson number for 3 would be one that tripled its value; the Dyson number for 4 would be one that quadrupled its value, and so on.�?

    The New York Times, Freeman Dyson’s 4th-Grade Math Puzzle, by John Tierney, April 6, 2009

    April 7, 2009