1 11 21 Riddle Answer – What Is the Next Number in This Sequence

1, 11, 21 Riddle is a tricky riddle and here is the answer. It’s a mathematical Puzzle in which you need to guess the next sequence number. This kind of riddles has a pattern in it which you have to find out.

Question: 1, 11, 21, 1211, 111221, 312211. What is the next number in the sequence?

Answer: The answer to “1 11 21 Riddle” is “13112221.”

The next sequence after the 312211 will be 13112221. The pattern in this puzzle is:

  • In each number one is increasing and decreasing (once places).
  • If you look the 2 number in Tens place its also increasing after each sequence.
  • Then see the third line after the 2 the one is also increasing and decreasing.
  • At last we will add one as the one is added every time as with the 2.
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