Level
pending

$1,11,21,1211,...$

Find the next term in the above sequence.

1122111
121212
121112
111221
2211121

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1 is read as "one one", and so the second number is 11. 11 is read as "two ones", so the third number is 21. 21 is read as "one two, one one", so the fourth number is 1211. 1211 is read as "one one, one two, two ones", so the fifth number is 111221.