Rather than words, let the numbers talk

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Rather than words, let the numbers talk:
1
11
21
1211
111221
312211
...
What's next?

Click here for Answer

Answer is 13112221
Logic:
Read the Previous Number 312211 as,
One 3, One 1, Two 2, Two 1 and write it in numbers:
13112221. Hence the answer !