A number 2a is prime, and a plus 20, a plus 40 are prime. What is a

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• 1. How many factors does a prime number have
• 2. How many factors do prime numbers have
• 3. B is prime. How many factors does B have?
• 4. Prime numbers have only a few factors, which are () and ()
• 5. The sum of the factors of a prime number is 20. What is the prime number
• 6. Is 20 a composite number or a prime number? The factors of 20 are ()
• 7. Judgment: the factor of a prime number is still a prime number. () 2. 20 is a factor of 20 and a multiple of 10 ()
• 8. All the factors of 36 () where the prime number has () and the composite number has () 26＝（ ）＋（ ）＝（ ）＋（ ）＝（ ）＋（ ） 12 = () + () = () - () = () × () × () fill in the appropriate prime number
• 9. Among the 36 factors, there are () prime numbers, () composite numbers and () even numbers
• 10. Which factors of 35, 24, 17, 14, 36, 23 are prime numbers and which are composite numbers?
• 11. A is prime, a + 40 and a + 80 are prime. What is a?
• 12. The concept of prime number a plus 40 is prime number a plus 80. What is prime number a equal to? ditto
• 13. A is a one digit prime. A + 40 and a + 80 are prime. What is a
• 14. The sum of three primes is 80. What is the maximum product of the three primes?
• 15. The sum of three different prime numbers is 82, and the product of these three prime factors is ()
• 16. The sum of three different primes is 82. What is the maximum product of these three primes
• 17. The sum of three different primes is 82, and the product of these three primes is ()
• 18. The sum of three different primes is 82. What is the maximum product of these three primes? The reason! Emergency iiiiiiiiiiiiii11
• 19. The product of prime number and prime number is a number
• 20. What is the product of prime number and prime number