It is not possible to multiply two prime numbers and get 90. You can add 43 and 47.
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The sum of the prime numbers 11 and 53 equals 64.
65
2 and 17
2 and 467 are two prime numbers whose sum is 469.
The sum of the prime numbers from 1 to 12 is equal to 2 + 3 + 5 + 7 + 11 = 28.