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2 is the only even Prime number, all other prime numbers are odd

Adding 3 odd number gives an odd number

So 2 is one of the 3 prime number, then the problem is equal to:

what 2 odd prime numbers add up to 28?

Odd Prime numbers less than 28 are: 3, 5, 7, 11, 13, 17, 19, 23

The only solutions (for 28)are: 5+23, 11+17

So the solutions (for 30) are: 2+5+23, 2+11+17

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12y ago

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