What is the next number in the sequence 1 11 21...

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Question: What is the next number in the sequence? 1 11 21 1211 111221 312211

Answer: The next number it: 13112221. Each number describes the previous number. Starting with 1, the second line describes it 11 (one 1). Then the third line describes 11 as 21 (two 1's). Then the fourth line describes 21 as 1211 (one 2, one 1). This is the pattern.

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