If they have to be different, none (because 1 is not prime). If they can be similar, the only combination is 3 + 3 + 3.
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if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
Multitudes of combinations...in what context? Prime numbers or what?
the answer is (41,2,and73)
61 + 3 + 2
73, 5 and 2