If the numbers were specified to be consecutive integers, then you could write:
Or if the numbers were specified to be consecutive odd integers, then you could write:
On the other hand, if the numbers were specified to be three consecutive even numbers, then there would be no solution because three even numbers, no matter what they are, sum to another even number and 63 is odd.
However, since you just said they are numbers with no hint of the relationship between them, the only thing you can write is:
For which the solution set is a set of ordered triples with infinite cardinality.
