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What is the next number in this series, 1, 11, 21, 1211, 111221, 312211, 13112221, ?

Question #20455. Asked by ??.
Last updated Jan 23 2018.

Taz
Answer has 20 votes
Currently Best Answer
Taz

Answer has 20 votes.

Currently voted the best answer.
1113213211 ... the sequence is: 1, 11 (or one 1), 21 (two 1's), 1211 (one 2, one 1), etc.

For the record, each number describes the previous one, using numbers only.

Jul 08 2002, 9:06 PM
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