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1311221
The last number consists of one 3 followed by one 1 followed by two 2s followed by two 1s Stringing all these numbers together gives 13112221
111221
Any answer would work, but the most 'obvious' answer is 111221. To see why, try reading the numbers out loud one digit at a time.
10 the sequence is 3 numbers miss one, three numbers miss one, etc
223455423122343
312211 13112221
331131211131221
1311221
1113213211
Next in sequence is 13112221.This series describes each number that came before it:1 [One]11 [One One]21 [Two One(s)]1211 [One Two and One One(s)]111221 [One One, One Two, and Two One(s)]312211 [Three One(s), Two Two(s), and One One]The next number in the series is:13112221 [One Three, One One, Two Two(s), Two One(s)]
The last number consists of one 3 followed by one 1 followed by two 2s followed by two 1s Stringing all these numbers together gives 13112221
111221
312 211 110 3-1=2 2-1=1 1-1=0
Any answer would work, but the most 'obvious' answer is 111221. To see why, try reading the numbers out loud one digit at a time.
9631. The sequence consists of the prime numbers which, when their digits are reversed, are perfect squares.
Fibonacci sequence adds the previous two numbers to get the next number. 1,1,2,3,5,8,13,21,34,55,89,144,233,377,610,987,1597