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In prime numbers within 30, plus 2 is still prime
One on the first floor is not prime
There are 3 5 11 17 29
How many primes are there after 30 Li prime plus 2?
Prime numbers within 30: 2 3 5 7 11 13 17 19 23 29
After adding 2: 4 5 7 9 13 15 19 21 25 31
Among them, 5 7 13 19 31 are prime numbers and 5 are prime numbers
Enumeration method is used to represent the set of all prime numbers less than 40
{2,3,5,7,11,13,17,19,23,29,31,37}
What are the prime numbers within 40
A: prime numbers within 40 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37
What primes can 36 consist of
The prime factor of 36 is 2.3
That is, 36 = 2 * 2 * 3 * 3
Two numbers are prime numbers. The sum of the two numbers is 15, and the product of the two numbers is 26. What are these two numbers?
Prime numbers are 2 and 13
2+13=15
2*13=26
Two numbers are prime numbers. The sum of two numbers is 8, and the product of two numbers is 15. How many are the two numbers
3 and 5
Our product is 143 and our sum is 24, both of which are prime numbers
1. First, we decompose 143 into a prime factor: 143 = 11 × 13
2、11+13=24
A: the two numbers are 11 and 13, respectively
The key to this problem is to decompose 143 into quality factors!
How many pairs of prime numbers are there
Three and seven are a couple
The product of two prime numbers must be______ ．
Prime x prime = product. The product is a multiple of two prime numbers. These two prime numbers are also the factors of the product. In this way, the factor of the product has these two prime numbers besides 1 and itself, so their product must be a composite number. So the answer is: composite number
RELATED INFORMATIONS
- 1. Which two primes can 48 be divided into 48 ＝（ ）＋（ ）＝（ ）＋（ ）＝（ ）＋ （ ） ＝（ ）＋（ ) ==（ ）
- 2. There are three prime numbers. The sum of the three of them is 18. The product of the three of them is 78. What are they?
- 3. 21 / 17 × (3 / 8-0.75) + 151 / 12 ÷ 17 / 21 the known natural number a has only two divisors, then 5A has at most three divisors List the formulas
- 4. If a and B are prime numbers, then M = a * B must be a composite number Is that right
- 5. Why are prime numbers and composite numbers
- 6. 100 = () + () = () + () (prime number)
- 7. The common factors of 12 and 18 are (), the largest of which is (). 12 and () are mutually prime numbers (fill in one possibility) The greatest common factor of 6 and 8 is () The greatest common factor of 17 and 51 is () The greatest common factor of 17 and 23 is () If M = 2 * 2 * 3 * 3, n = 2 * 3 * 5, then the greatest common factor of M and N is () Two, three, four and five can form a pair of Coprime numbers If there is a two digit number whose two digits are combined and prime to each other, the minimum of the two digits is () It is known that M = 2 * 3 * A and N = 2 * 7 * A. if the greatest common factor of M and N is 10, then a = () Two numbers that become coprime () Use a number to divide 32 and 28 exactly. The maximum number is ()
- 8. If the least common multiple of two prime numbers is 21, then the two prime numbers are () and (), respectively
- 9. Point out which of the following groups of numbers are coprime (1) 3 and 4; (2) 4 and 6; (3) 6 and 1; (4) 15 and 16; (5) 18 and 20; (6) 19 and 24; (7) 24 and 25; (8) 49 and 50 Come on, I'll give you a reward!
- 10. Put the proper prime number in the brackets 8 = （ ）＋ （ ﹚ 12 = ﹙ ﹚＋ ﹙ ﹚＋ ﹙ ﹚ 15 = ﹙ ﹚＋﹙ ﹚ 18 = ﹙ ﹚＋﹙ ﹚＋﹙ ﹚ If you think about it, the sum of the maximum factor and the minimum multiple of a number is 62. This number is 62_______
- 11. The product of two primes is 145 and the sum is 34. What is the larger of the two primes? Just answer, not use what you say
- 12. Decomposition prime 7,11,13,17,19,23,
- 13. There are () different ways to write 40 as the sum of two primes A. 2B. 3C. 4D. 5
- 14. The difference between two prime numbers is 2, and the product is 35. What are these two prime numbers
- 15. It is known that the product of two inner terms in a proportion is the smallest prime number, one outer term is 6 / 7, and the other outer term is () How much?
- 16. The quotient of a number divided by 9 is the same as the remainder. The remainder is 15. The prime number is () fast! Today,
- 17. It is proved that if P is a prime greater than 5, then p 2 - 1 is a multiple of 24
- 18. The solution of the equation a (x + m) 2 + B = 0 of X is X1 = - 2, X2 = 1, (a, m, B are all constants, a ≠ 0), then the solution of the equation a (x + m + 2) 2 + B = 0 is______ ．
- 19. Mathematical proof problem: when n > 2, the nth power of any prime number cannot be decomposed into the sum of the same power (nth power) of two prime numbers Because a / (B + 2) = 1, B = A-2, why
- 20. Factorization: - 45x ^ 4Y ^ 2Z ^ 3 + 18x ^ 3Y ^ 2Z ^ 2 + 90x ^ 2Y ^ 2Z ^ 2