play@numbers
Number Theory
Level
2
What row of numbers comes next in this series?
1 11 21 1211 111221 312211 13112221
The answer is 1113213211.
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1 solution
Relevant wiki: Look and Say Sequence
This is the Look and Say Sequence.
In the last term, there are "one 1, one 3, two 1s, three 2s, one 1", so the next term is "1113213211 "