Write two coprime numbers that meet the requirements. (1) both are prime numbers () (2) both are composite numbers () (3) both are odd numbers () (4) a prime number and a composite number A cuboid is 8 cm long, 6 cm wide and 5 cm high. Its bottom area is () square cm, its surface area is () square cm and its volume is () cubic cm

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• 1. Is a prime number and a composite number necessarily coprime
• 2. () and () are prime numbers and composite numbers. They are coprime RT
• 3. There are two natural numbers, even if their coprime numbers are composite numbers. If the least common multiple of these two numbers is 72, what are the two fractions
• 4. Two numbers are compound numbers and coprime numbers. Their least common multiple is 120. The greatest common divisor of these two numbers is______ Where the smaller sum is______ ．
• 5. In two continuous natural numbers less than 10, () and () are both composite numbers and coprime numbers. If the least common multiple of these two numbers is decomposed, the prime factor is ()
• 6. 1. How many primes are there at most among the 20 consecutive natural numbers?
• 7. In the natural number 1-20, which number is even and prime
• 8. If natural numbers n + 3 and N + 7 are prime numbers, find the remainder of N divided by 6
• 9. Is the value of F (n) = N2 + N + 41 prime when n = 1,2,3
• 10. There are four natural numbers less than 10, and their product is 1080. It is known that only one of the four numbers is prime, and this prime is ()
• 11. Write a prime number that is coprime with 6. Write a composite number that is coprime with 6
• 12. The sum of all prime numbers within 10 is______ Is a prime and even number______ ．
• 13. I am a prime number, my one digit and ten digit are two adjacent composite numbers in the natural number, I am ()
• 14. The sum of two adjacent natural numbers is 17, one is prime and the other is composite. What are these two numbers?
• 15. At 1, 2, 3 If there are p prime numbers, Q composite numbers, m odd numbers and n even numbers, then (P-M) + (q-n)=______ ．
• 16. If there are p prime numbers, Q composite numbers, s even numbers and t odd numbers in the first n natural numbers, then (P-T) + (Q-S) =? Strive to be specific
• 17. In 0,1,2,3. Of these natural numbers, if there are x prime numbers, a odd numbers, Y composite numbers and B even numbers, then
• 18. Has the proposition that the multiple of 6 plus one is a prime number been proved?
• 19. If n is prime, N + 2 is prime and N > 10, we prove that N + (n + 2) is a multiple of 12
• 20. A is a prime less than 10, a + 40 is a prime, a + 80 is a prime, and a is a prime______ ．