"Proper" in math means "not equal to self", and 17 is prime, so there is only one: 1. Prime numbers don't have proper factors.
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85 is a composite number because it has factors other than 1 and itself.The 4 factors of 85 are 1, 5, 17, and 85.The factor pairs of 85 are 1 x 85 and 5 x 17.The proper factors of 85 are 1, 5, and 17 or,if the definition you are using excludes 1, they are 5 and 17.The prime factors of 85 are 5 and 17.The distinct prime factors of 85 are also 5 and 17, since there is no repetition of factors.The prime factorization of 85 is 5 x 17.5 and 17 (both prime)85 = 5 x 17
119 is a composite number; it has factors other than 1 and itself.The four factors of 119 are 1, 7, 17, and 119.The factor pairs of 119 are 1 x 119 and 7 x 17.The proper factors of 119 are 1, 7, and 17 or,if the definition you are using excludes 1, they are 7 and 17.The prime factors of 119 are 7 and 17.The 2 distinct prime factors (listing each prime factor only once) of 119 are 7 and 17.The prime factorization of 119 is 7 x 17.NOTE: There cannot be common factors, a greatest common factor, or a least common multiple of a single number because "common" refers to factors or multiples that two or more numbers have in common.
Prime numbers, like 29, don't have proper factors.
1, -1, 2, -2, 17, -17, 34, -34 2 and 17 are prime.
The proper prime factors of 275 are 5,5,11.