1, 11, 21, 1211, 111221, ask what the next number is

The rules are as follows:

11--- means that the previous number "1" is 1 1;

21 --- indicates that the previous number "11" is made up of 2 1s;

1211--- means that the previous number "21" is made up of 1 1;

111221--- i.e. 11 12 21 means that the previous number "1211" is composed of 1 1, 1 2, and 2 1s;

Therefore, the next number should be filled in 312211---, i.e. 31 22 11, which means that the previous number "111221" is composed of 3 1s, 2 2s, and 1 1s;

In the same way, the next number is filled in according to the 312211 13112221--- i.e. 13 11 22 21, which means that the previous number "312211" is composed of 1 3, 1 1, 2 2, and 2 1s.

My answer is 2111121211

The answer is divided into three parts: 21, 1112, 1211. The last 1211 is not explained, and the middle 1112 is derived from the 111221 of the number above. Because the first part of 1211 is 12, and the 2 in 1211 is the 2 in 21

So the middle part of the sixth number should be the first part of the fifth number. The first part can be seen in the first part of the first five numbers. The first three don't, the fourth 1, and the fifth 11, so I'm guessing that the sixth should be 21. Push over.

Group these numbers according to the following rules:

Look at 1 first, the number of the following 1 is 2 times the number of the previous 1, and then subtract one; Looking at 2 again, the number of 2s in the back is 2 times the number of the previous 2. So the following number is 11111111122222222.

Rule 1: All numbers in the previous row are replaced with 1, that is, there are 3 numbers in the first row and 3 1s in the second row; The second row has five numbers, the third row has five 1s, and the number 2 is one less than 1.

Rule 2: The total number is n 2 - n + 3, the number of 1 is (n 2 - n + 3) + 1 2, and the number of 2 is (n 2 - n + 3) - 1 2, where n is the number of rows.

In line 1, 1 2-1+3=3,Number of 1(3+1) 2=2,Number of 2(3-1) 2=1

In line 4, 4 2-4+3=15,Number of 1 (15+1) 2=8,Number of 2 (15-1) 2=7

The rule is that 111 --- means that the previous number "1" is 1 1;21 --- means that the previous number "11" is composed of 2 1s; 1211--- means that the previous number "21" is composed of 1 and 1; 111221--- i.e. 11 12 21 means that the previous number "1211" is composed of 1 1, 1 2, and 2 1s; So the next one is 312211 done.

The law is:

11--- means that the previous number "1" is 1 1;

21 --- indicates that the previous number "11" is made up of 2 1s;

1211--- means that the previous number "21" is made up of 1 1;

111221--- i.e. 11 12 21 means that the previous number "1211" is composed of 1 1, 1 2, and 2 1s;

312211--- i.e. 31 22 11, which means that the previous number "111221" is composed of 3 1s, 2 2s, and 1 1s in turn;

Therefore, the next number should be filled in 13112221---, i.e. 13 11 22 21, which means that the previous number "312211" is composed of 1 3, 1 1, 2 2, and 2 1s;

In the same way, the next number is 1113213211 according to "13112221", which means that the previous number "13112221" is composed of 1 1, 1 3, 2 1, 3 2, and 1 1.

It's a brain teaser.

I've done it before.

12, that's a number.

1112, which is read as 1 1, 1 2, is because the mass contains 1 1 and 1 2 for the above number

3112, which is pronounced as 3 1s, 1 2, is because the numbers above contain 3 1s, 1 2211213, and is read as 2 1s, 1 2s, and 1 3s, and this is because the numbers on it have exactly 2 1s, 1 2s, and 1 3s

The law of this number series reflects the change in the composition of the number, the number has a small to large change, and the beginning and end of the number of the mill are 1, and then the number starts from the two digits, and the middle of the number is only 0 and the regular change: 11-101-111-181-1001-1111-1881-10001-11011-11111-11811, when the number is even annihilation number, 1 and 0 or.

The law is:

11--- means that the previous number "1" is 1 1;

21 --- indicates that the previous number "11" is made up of 2 1s;

1211--- means that the previous number "21" is made up of 1 1;

111221--- i.e. 11 12 21 means that the previous number "1211" is composed of 1 1, 1 2, and 2 1s;

312211--- i.e. 31 22 11, which means that the previous number "111221" is composed of 3 1s, 2 2s, and 1 1s in turn;

Therefore, the next number should be filled in 13112221---, i.e. 13 11 22 21, which means that the previous number "312211" is composed of 1 3, 1 1, 2 2, and 2 1s;

In the same way, the next number is 1113213211 according to "13112221", which means that the previous number "13112221" is composed of 1 1, 1 3, 2 1, 3 2, and 1 1.

Pasted answers, I can't think of on my own. Hehe.

The rule is as follows: 1 11 --- means that the previous number "1" is 1 1;21 --- indicates that the previous number "11" is made up of 2 1s; 1211--- means that the previous number "21" is made up of 1 1; 111221--- i.e. 11 12 21 means that the previous number "1211" is sequentially composed of 1 ...

The rule is: 111 ---

Indicates that the previous number "1" is 1.

The previous number "11" is represented by 2

1 composition; 1211---

The previous number "21" is represented by 1

Each 1 is composed; 111221--- i.e. 11

It means that the previous number "1211" is sequentially composed of 1.

1, 1 pcs. 2, 2 pcs.

The rules are as follows:

Indicates that the previous number "1" is 1.

The previous number "11" is represented by 2

1 composition; 1211---

The previous number "21" is represented by 1

Each 1 is composed; 111221--- i.e. 11

It means that the previous number "1211" is sequentially composed of 1.

1, 1 pcs. 2, 2 pcs.

1 composition; Therefore, the next number should be filled in 312211--- i.e. 3122

11, indicating that the previous number "111221" is successively composed of 3 1 and 2.

2, 1 pcs. 1 composition;

In the same way, the next number is filled in according to the 312211.

13112221--- i.e. 13

21, indicating that the previous number "312211" is successively composed of 1 3 and 1.

1, 2 pcs. 2, 2 pcs.

1 composition;

1 is 1 1 1 is 11

11 is 2 1s and 21

21 is 1 2 1 1 is 12111211 1 11 2 2 1 is 111221111221 is 3 1 2 2 1 is 1 312211