Riddle:
Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211
?
Show Hint
Hint:
Each line describes the last in some way.
Show Answer
Answer:
The next number should be 13112221. Why?
Because each of these numbers describes the previous number. Starting with 1, the 2nd line is 11 (one one), then the 3rd line describes 11 as 21(two ones). Then the 4th line is
1211 which describes (one 2, one 1). And so forth...