Complete the following series:
1 - 11 - 21 - 1211 - 111221 - 312211
What number would be next?

13112221.
Because:
1 = 11
22 = 22
111 = 31
11 = 21
33 = 23

Complete the following series:
1 - 11 - 21 - 1211 - 111221 - 312211
What number would be next?

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