97 + 2
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54 and 99 are not prime numbers because they have more than two factors.
If the two numbers are relatively prime, their least common multiple is their product. The prime factors of 99 are 3, 3, and 11. Since the two numbers are relatively prime, the possibilities are 9 and 11 or 1 and 99. The pair of 9 and 11 add up to 20 and their least common multiple is 99. So, 9 and 11 are the two numbers.
12, 49, and 99 are composite, the rest are prime.
None of them are prime numbers because they each have more than two factors.
No.