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It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.
90 is composite, 117 is prime.
89 and 91 are both prime numbers, so when asked the prime number closest to 90, the answer is that 90 is surrounded by two prime numbers
It is impossible for three prime numbers less than 30 to add up to 1955. After all, 30+30+30 is only 90.
The prime factors are: 2 3 5