Pattern and Logic
Number Theory
Level
2
What is the next sequence in the pattern? 1, 11, 21, 1211, 111221, 312211, 13112221, 1113213211, ?
The answer is 31131211131221.
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This is a look and say sequence in which you read the number and write it down. For instance, the number 1 is read as one-1, that is 11. 11 is read as two-1, that is 21.