A problem by Lakkoju Dilip
Level
pending
What is the next number in this sequence, 1, 11, 21, 1211, 111221 , 312211 ?
The answer is 13112221.
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1 solution
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)]