What is the next number in this series?
1, 11, 21, 1211, 111221, 312211
A: 13112221
as the last number listed above is 312211
one 3 one 1 two 2 two 1
1, 11, 21, 1211 , 111221, 312211, 13112221, ...
The pattern is that the next term comes from counting how many of each numbers are in the previous term. For example, the second term is 11 because there is ONE "1" in the previous term. The third term, likewise, is 21 because there are TWO "1" in the previous term. Next term is ONE "2", ONE "1", and then ONE "1", ONE "2", TWO "1", and so on and so forth.
as the last number listed above is 312211
one 3 one 1 two 2 two 1
1, 11, 21, 1211 , 111221, 312211, 13112221, ...
The pattern is that the next term comes from counting how many of each numbers are in the previous term. For example, the second term is 11 because there is ONE "1" in the previous term. The third term, likewise, is 21 because there are TWO "1" in the previous term. Next term is ONE "2", ONE "1", and then ONE "1", ONE "2", TWO "1", and so on and so forth.
