Here is a number sequence:

1 11 21 1211 111221

This may seem like a strange sequence, but there is still a system behind it...

The question: What is the next number in the sequence?

The solution: Click here!

Question 2: Here is another number sequence:

1 11 21 1211 1231 131221

What is the next number in this sequence?

The solution: Click here!

Question 3: Here is one more number sequence:

0 10 1110 3110 132110 1113122110

What is the next number in this sequence?

The solution: Click here!