There are infinitely many solutions.
... , -2 + 25, -1 + 24, 0 + 23, 1 +22, 2 + 21, ...
and
... , -2 - 1 + 26, -2 + 0 + 25, -2 + 1 + 24, ... , -1 - 1 + 25, -1 + 0 + 24, ... and infinitely many other triplets,
and quadruplets etc.
and then there are decimals to 1 place,
and decimals to 2 places,
etc,
and infinitely recurring decimals.
Also you must not forget surds. In pairs, triplets, quadruplets, etc.
And finally, if you are really serious about it, there are also sets of complex numbers.
83
They are both prime numbers and they add up to 23+61 = 84
5 and 23
23
73
if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23
-23
47
23
23+11+61=95 :)
23 and 19 are both prime numbers and they add up to 42.
The numbers are 21, 22, 23, 24, and 25.