complete the series....
Number Theory
Level
2
Find the next no. 1,11,21,1211,111221,312211,13112221,?
The answer is 1113213211.
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The numbers describe the previous number in the sequence, starting with 1. For example, 11 describes one (one one), 21 describes 11 (two ones), and so on. 1113213211 is created via (one one one three two ones three twos one one). Thus, 1113213211 is the answer. Find out more about this sequence at oeis.org .