11 is not a composite number.

Factors of 29: 1, 29.

29 is the 10th prime number. Prime numbers have 2 distinct factors. 29 is prime. Hence, the factors of 29 can only be 1 and 29.

29 is not a composite number.

13 is not a composite number.

which is not prime (i.e., which has factors other than 1 and itself). The first few composite numbers (sometimes called “composites” for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16, There are an infinite number of composite numbers. …

32 is a composite number.

15 prime numbers

The common factor of 14 and 15 is only 1. So, 14 and 15 are coprime numbers.

There are 8 positive integers less than 15 and co- prime with 15. They are 1, 2, 4, 7, 8, 11, 13 and 14.

Coprime numbers, prime to each other, relatively prime: 12 and 49?

• 12 and 49: coprime numbers?
• 12 and 49 are coprime (relatively, mutually prime) if they have no common prime factors, that is, if their greatest (highest) common factor (divisor), gcf, hcf, gcd, is 1.

17 and 68 are not co-prime because 1 is not the only common factor of these numbers. Example, 17 is another common factor of 17 and 68.

The factors of 31 are 1 and 31 and the factors of 93 are 1, 3 and 31. Here 31 and 93 have two common factors: they are 1 and 31. Hence, their HCF is 31 and they are not co-prime.

If two numbers are co-prime then the HCF of two numbers must be 1. In (31, 93), HCF of 31 and 93 is 31. In (32, 62), HCF of 32 and 62 is 2.

For example, 2 and 3 are two prime numbers. Factors of 2 are 1, 2, and factors of 3 are 1, 3. The only common factor is 1 and hence they are co-prime. Any two successive numbers/ integers are always co-prime: Take any consecutive numbers such as 2, 3, or 3, 4 or 5, 6, and so on; they have 1 as their HCF.

∴ 8 and 14 are not a pair of co-prime numbers. ∴ 4 and 5 are a pair of co-prime numbers.