by LeMeThink on February 20th, 2007

LeMeThink

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What is the next number in this series: 1, 11, 21, 1211, 111221,......?

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  • by Box of Chocolates on February 20th, 2007

    Box of Chocolates

    111221 is three ones, two two's, and one one.
    The next number is 312211.

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