1113213211
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312211 13112221
331131211131221
The next number in this sequence is 13112221.
Is the fourth term correct? Should it not be 111221? Then the next term would be 13112221
Next in sequence is 13112221.This series describes each number that came before it:1 [One]11 [One One]21 [Two One(s)]1211 [One Two and One One(s)]111221 [One One, One Two, and Two One(s)]312211 [Three One(s), Two Two(s), and One One]The next number in the series is:13112221 [One Three, One One, Two Two(s), Two One(s)]