I found an answer from www.quora.com

**What is the next number in this sequence**: **1**, **11**, **21**, **1211**, **111221** ...

Puzzle: What will be the **next number** in this incredibly tough **sequence**: 6, **21** ...
**What is the next** element of the **following** series: (**1**),(**11**),(**21**), (**1211**), (1231), (
131221). .... **312211** -> "1three, **1** one, 2 twos, 2 ones"; Seventh member->
**13112221** ...

For more information, see **What is the next number in this sequence**: **1**, **11**, **21**, **1211**, **111221** ...

I found an answer from challenges.wolfram.com

Look and Say **Sequence** | Wolfram Challenges

Now look at the second **term** 11 and say, "two ones" to get the third **term** 21. Look
at the third **term** ... **term** 1211. This gives the **sequence 1**, **11**, **21**, **1211**, **111221**,
… ... Out[2]= {**1**, **11**, **21**, **1211**, **111221**, **312211**, **13112221**, 1113213211. In[3]:=.

For more information, see Look and Say **Sequence** | Wolfram Challenges

I found an answer from mathworld.wolfram.com

Look and Say **Sequence** -- from Wolfram MathWorld

The integer **sequence** beginning with a single digit in which the **next term** is
obtained ... 1, A005150, **1**, **11**, **21**, **1211**, **111221**, **312211**, **13112221**,
1113213211, .

For more information, see Look and Say **Sequence** -- from Wolfram MathWorld

I found an answer from en.wikipedia.org

Look-and-say **sequence** - Wikipedia

In mathematics, the look-and-say **sequence** is the **sequence** of integers
beginning as follows: 1 ... 111221 is read off as "three 1s, two 2s, then one 1" or
**312211**. ..... the puzzle "**What is the next number** in the **sequence 1**, **11**, **21**, **1211**,
**111221**?

For more information, see Look-and-say **sequence** - Wikipedia

I found an answer from answers.yahoo.com

what is the pattern?: **1**, **11**, **21**, **1211**, **111221**, **312211**, **13112221** ...

**1** = one **11** = one one (the preceding step had one one) **21** = two one (the ...
When you say this aloud you get the **next sequence**. B. **1 1**. That's 2 ones, so C is:

For more information, see what is the pattern?: **1**, **11**, **21**, **1211**, **111221**, **312211**, **13112221** ...

I found an answer from br.answers.yahoo.com

what follows on : **1** , **11** , **21** ,**1211** ,**111221** ,**312211** , **13112221** ...

And that is one one, one two, and two ones: "111221" ... Examine carefully the
**following sequences** of **numbers**: **1**, **11**, **21**, **1211**, **111221**, **312211**, **13112221**, ...

For more information, see what follows on : **1** , **11** , **21** ,**1211** ,**111221** ,**312211** , **13112221** ...

I found an answer from it.answers.yahoo.com

**1 11 21 1211 111221 312211 13112221** ect.?

giuro ke c'ho messo 5 minuti per arrivarci.. ma alla fine ce l'ho fatta 31131211131221.. bello xò!!

For more information, see **1 11 21 1211 111221 312211 13112221** ect.?