If a two digit number is a prime number, the sum of the numbers is a prime number. Moreover, if the two digits are multiplied by 3, 5 and 7 respectively, the sum of the numbers obtained is still a prime number, and the two digits satisfying the condition are______ ．

Let this number be X. because the sum of the numbers is prime, the numbers on the individual and ten digits must be odd and even different. Because the sum of the numbers obtained by multiplying the two digits by 3 is still prime, so the sum of the numbers of 3x must be 3

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1. If a two digit number is a prime number, and if the two digit number is multiplied by 3, 5 and 7 respectively, the number sum of the number obtained is still a prime number, then it is satisfied
2. If a two digit number is a prime number, the sum of the numbers is a prime number. Moreover, if the two digits are multiplied by 3, 5 and 7 respectively, the sum of the numbers obtained is still a prime number, and the two digits satisfying the condition are______ ．
3. How can the plus sign be equal to 99
4. How do 2, 3, 4, 5, 6, 7, 8, 9 add some plus signs to make it equal to 99
5. From 1 to 9, 9 numbers in order, add a plus sign into the formula, each question is equal to 99, see how many you can add
6. What is the sum of natural numbers 1 to 99?
7. The sum of two adjacent natural numbers is 99 equation
8. There are a series of numbers 1, 9, 7, 2. From the fifth number, each number is equal to the sum of the first four digits, and so on, In the first 119 numbers, there are several even numbers
9. A prime number is a two digit number composed of two numbers. The sum of the two numbers is 8 and the difference between the two numbers is 2. What is the prime number?
10. A prime number is a two digit number composed of two numbers. The sum of the two numbers is 8 and the difference between the two numbers is 2. What is the prime number?
11. It is a two digit number less than 45, it is a prime number, the sum of the numbers is 7, the difference of the numbers is 1, the number is ()
12. It is a two digit number less than 45 and a prime number. The sum of odd numbers is 7, and the difference is 1. What is the number? emergency
13. It is not only a two digit number less than 45, but also a prime number. The sum of odd numbers is 7, and the difference between the numbers is 1. What is the number? (to be expressed)
14. If a prime number is a two digit number and the difference between its one digit number and its ten digit number is 7, then the prime number is zero______ ．
15. It's a two digit number less than 45. It's a prime number. The sum of the numbers is 7, and the difference is 1. What's the number?
16. Ten numbers 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are combined to form three three digit numbers and one one one digit number, and the sum of these four numbers is 999. The maximum three digit number is required to be as small as possible, so what is the maximum three digit number?
17. Use 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 to form six digits There must be five, one, eight, six in it
18. How many possibilities are there for a six digit password composed of 0,1,2,3,4,5,6,7,8,9 Line it up
19. Use the nine numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 to form prime numbers. If each number has to be used and can only be used once, how many prime numbers can these nine numbers form at most?
20. Use 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to form prime numbers. Each number can only be used once. What is the minimum sum of prime numbers?