30 and 90 are two of many numbers whose prime factors include 2, 3, and 5.
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A set of numbers whose GCF is one are called co-prime or relatively prime
There are two numbers, 7 and 49, whose smallest prime factor is 7 in the set of numbers from 1 to 100.
Well, well, well, look at you trying to stump me. The prime numbers less than 30 that multiply to 1955 are 5, 13, and 31. Yep, you heard me right, 31 is not less than 30, but it sure is a prime number that gets the job done.
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The GCF of 26 and 65 is 13. 13 is a prime number. "Relatively prime" refers to numbers whose GCF is 1.