Find the Next No.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211




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To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

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What does this mean?
N
A
E
L
C

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If nine thousand, nine hundred nine dollars is written as $9,909,
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Amazing Facts

No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki