Number pattern
Level
pending
1,11,21,1211,111221,312211,13112221, _ _ _ _ .
3211121221
13111221
12112111
1113213211
1211213122
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1 solution
-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. -1211 is read as "one one, one two, two ones", so the fifth number is 111221 -So, 13112221 is read as "one one, one three, two ones, three two and one one", so the number is1113213211.