## Blog

1, 11, 21, 1211, 111221, 312211, …

Can you figure out the last number in this sequence? —————————————

Think this riddle is difficult? Hint: Try saying it out loud to find the answer! 😉

Answer: 13112221

**Explanation: **

Each successive number is formed by looking at the preceding number and reading out the digits, grouping like digits together and saying the number of identical digits followed by the digit. For example, **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. As such, the last number in this sequence is 13112221!

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