The number of 2,3,5,7 in 1-1000 How to ask?

In 1-1000, the number that can divide 2,3,5,7 at the same time is equal to the number that can divide 210 at the same time, that is 1000 / 210 = 4

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1. C + + programming 1. Judge and output the first 20 numbers between [11000] which can be divided by 5 and 7 at the same time, and The sum of these 20 numbers 2. Output all prime numbers between 100 and 200, and count the number of prime numbers and the sum of all prime numbers 3. There are 10 students in a certain class. Their student number and examination results of mathematics are as follows: Student number: 101 102 103 104 105 106 107 108 109 110 Results: 78 90 56 66 89 76 88 90 91 50 Please complete the programming: (1) Average score of the whole class; (2) Print out the student number and corresponding score of the students with average score or above
2. How many of these 1000 natural numbers can't be divisible by 5 and 7 at the same time?
3. A total of numbers from 1 to 10000 that cannot be divisible by 5 or 7______ One
4. Find the number of 1 ~ 1000 that can be divided by 2 or 3 or 5
5. Find the number of integers in 101000 that can be divided by at least one of 5,7,9
6. How many numbers can be divided by 2 or 3 in 1-1000?
7. Sum of numbers divisible by 3 and 7 in 1000
8. Find out the number from 10 to 1000 that can be divided by 2, 3 and 7 at the same time, and output
9. In 18, 27, 30, 46, 51, 65102 The number divisible by two is_________ What is the number divisible by 5_________
10. The two digits divisible by 17 are 17, 34, 51, 68 and 85, and the two digits divisible by 23 are 23, 46, 69 and 92
11. From 1 to 1000, how many numbers can be divided by 3 or 7
12. Find the sum of numbers from 1000 to 4000 that satisfy the condition that the sum of all factors of the number can be divisible by 3 and 7 at the same time
13. What are the characteristics of numbers divisible by 72
14. What are the characteristics of numbers divisible by 3 and 9? Five examples
15. If the sum of your numbers can be divided by 9, then the number can be divided by 9. Please explain the reason and give a characteristic that three digits can be divided by 7
16. How to prove that the sum of each digit of a number can be divided by 3, then the number can also be divided by 3? Please show me the process, don't give me an example But what I want is a general formula, not an example. If it's five digits or six digits (I say a number, you can't be sure it's four digits), you can't prove it in this way
17. If the sum of the numbers of an integer can be divided by 3 (or 9), then the number must be divided by () or ()
18. The maximum two digits that can be divisible by 2 and 3 at the same time are () and the minimum two digits that can be divisible by 3 and 5 at the same time are () and () respectively
19. Characteristics of numbers divisible by 2,3,5,9
20. What are the characteristics of numbers divisible by 2 and 5 at the same time