Find a rule and fill in the number 1 3 4 7 7 11 10 15 13. What should be the next one?

(1 3) (4 7) (7 11) (10 15) (13 )
It can be seen from the above that the differences between the front and back numbers in brackets are 2, 3, 4 and 5 respectively
So, the next bracket should be 6, so the next number is 19
The last number in each bracket is 1, 0, - 1, - 2 more than the first number in the following bracket

RELATED INFORMATIONS

1. 1、1、2、3、5、8、___ 、____ 、____ Find the rules and fill them in,
2. The first grade of primary school looks for rules 1, 2, 4, 5, 8, 10, (), ()
3. 2,3, - 6,8,10, - 12,14, (), (), ()
4. Find the law 12 9 2 6 8 3 4 5 12 9 2 6 8 3 4 5, what's the question mark?
5. 2 + 6 = 8 4 + 8 = 12 5 + 9 = 14 6 + a = B find the rule ~ write down what are a and B respectively? Like the title, Love also writes out what the law is
6. Find the rule 1 / 4, negative 1 / 3, 7 / 16, negative 13 / 25, 7 / 12 What is the eighth number?
7. Find the rule: 6, 9, (), (), 8, 10 There are 3, (), (), 76, 3, 5, 3, 4, (), 9 () How do you write it?
8. There is a set of numbers: 5, 10, 15, 20, 25, 30. What rules do you find, expressed by the formula containing letters
9. 9-1 = 8 * 1 25-9 = 8 * 2 49-25 = 8 * 3 81-49 = 8 * 4, what rule do you find by observing the above formula? Express this rule with formula (letter)
10. There are 240 students in Grade 6, including 50 in class 6 (1), 60 in class 6 (2), 20.8% in class 6 (1), and the center angle of fan-shaped circle in class 6 (2) []
11. Find the rule and fill in 10 10 9 7 How to fill in the following questions,
12. Find the rule and fill in 7,9,10,9,13 () () Why?
13. Fill in 4,1, (). 1 / 16,1 / 64 according to the rule
14. Fill in 7,10,20,23,33, (), () 4,1, (), 1 / 16 and 1 / 64 according to the rule
15. Find the law: 3 / 4, 1 / 2, 1 / 3, 2 / 9, (), ()
16. I met such a question in the sixth grade paper of primary school: find the rules, fill in: 2,6,15 (), 56, (), 141 Urgent need help, I know the answer, but do not know the law, seek, analysis. Thank you
17. Fill in the blanks: 1,2,4,7,11, (), () Elder sister, elder brother, the moon rabbit is here. Thank you
18. Find the rule and fill in 2, 1, 4, 1, 7, 1, 11 2、1、4、1、7、1、11、（）（） 2、3、5、8、13、（）（） Four fifths, two fifths, one fifths, one tenth, () one eightieth, () 1、2、4、7、11、（）（） 1、4、9、16、（）（）（8、12）（6、14）（11、9）（ 15） 16. 4, 1, quarter, () () 1 / 5, 0.4, 3 / 5, 0.8 () () 7、5、14、4、21、3（）（）
19. Find the law 1,8,27,64, (), () 1,2,4,6,7,10,10, (), () 1 Find the law 1,8,27,64,（）,（） 1,2,4,6,7,10,10,（）,（） 1,2,3,5,8,13,（）,（）
20. Find the law 1.2.4.6.10.16 (), (), () 2.1.8.27.64 (), () 3.1.2.4.7.11 Find out the law 1.2.4.6.10.16 (), (), () 2.1.8.27.64 (), () 3.1.2.4.7.11. (), ()