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#1 bonanova

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Posted 04 February 2008 - 09:27 AM

1, 11, 21, 1211, 111221, 312211, _____, _______ ?
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#2 rookie1ja

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Posted 04 February 2008 - 09:56 AM

good one, however, it has been already posted a few times before ... for instance, check the following Sequence Puzzle

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