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Look and Say Sequence: 1,11,21,1211,111221,312211,13112221,?
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What is the next number in this look and say sequence: 1, 11, 21, 1211, 111221, 312211, 13112221,?

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This sequence is commonly called "look-and-say sequence"
In this sequence each successive number is formed by looking at the preceding number and reading out the digits and grouping like digits together and saying the number of identical digits followed by the digit.

1 --->(one one)
11 --->(two one)
21 --->(one two,one one)
1211 --->(one one,one two,two one)
111221 --->(three one,two two,one one)
312211 --->(one three,one one,two two,two one)
13112221--->(one one,one three,two one,three two,one one)--->1113213211

So next number in this sequence is 1113213211

Look-and-Say sequences can be started with any number from (0-9)

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