5, 7, 47
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The first 8 prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19. Their sum is 77.
3 and 59
Some odd numbers can be written as the sum of prime numbers. 2 + 3 = 5
There are five ways to get a sum of 70 with two prime numbers: 3 + 67 = 70 11 + 59 = 70 17 + 53 = 70 23 + 47 = 70 29 + 41 = 70.
That isn't possible. The sum of three odd numbers will always be odd. You can make the sum of 3 prime numbers equal to 32 if one of them is 2 (which is not odd).