What is the next number in the sequence?
The next number it: 13112221. Each number describes the previous number. Starting with 1, the second line describes it 11 (one 1). Then the third line describes 11 as 21 (two 1’s). Then the fourth line describes 21 as 1211 (one 2, one 1). This is the pattern.
The next number in this series will be: 13112221. Here each number tells the story of how previous number was formed. Each number tells you about the occurence of each digit in a number.
Explanation: First number is 1. This number has just 1 “1”, so the next number becomes 11. Now, this number has 2 “1”‘s, so the next number is 21. Then, this number has 1 “2” and 1 “1”, so the next number becomes 1211. This number has 1″1″, then 1 “2” and 2 “1”‘s, so the next number becomes 111221 and so on.
This sequence is based on Run Length Encoding: https://en.wikipedia.org/wiki/Run-length_encoding
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