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    Nodogs's Avatar
    Nodogs Posts: 1, Reputation: 1
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    #1

    Feb 28, 2007, 10:41 AM
    Nunber sequences
    I need to know the next number sequence and how you got there! 1,11, 21, 1211, 111221, ___?___
    toryadamz's Avatar
    toryadamz Posts: 18, Reputation: 0
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    #2

    Feb 28, 2007, 10:48 AM
    Quote Originally Posted by Nodogs
    I need to know the next number sequence and how you got there! 1,11, 21, 1211, 111221, ___?___
    I should slap you:

    It would be something like 11111221 multiply by two
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #3

    Feb 28, 2007, 10:51 AM
    This is a classic sequence.

    312211 is the next term:

    It's a self describing sequence, A005150 in OEIS

    The first term is 1, the second is 11 (one 1), the third is 21 (two 1s), the fourth is 1211 (one 2 one 1), the next is 111221 (one 1 one 2 two 1s), so the next is 312211 (three 1s two 2s one 1), etc.

    Good try toryadamz :)
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