They all have two unique factors.
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All prime numbers are special numbers because they help us to find the lowest common multiple of numbers and their highest common factor.
86 and 154 are not relatively prime because they are both even numbers. Relatively prime numbers have no common factors other than 1, and all even numbers have 2 as a common factor.
Since 12 is a factor of 24, all of its factors, prime or otherwise, are common.
As the numbers are all prime, the only factors each of them has are 1 and the number itself. Therefore the greatest, and only, common factor of two of more prime numbers is 1.
They are all prime numbers. They are all consecutive odd numbers They are all factors of 105