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Numbers. i^n = i^(n mod 4). With n = 27, 27 mod 4...
The numbers are: 27 and 23
4 and any multiple of 4 have a GCF of 4.
4
If it's a linear function, 3 should do, but 4 will give an extra check on you work. If the function is quadratic exponential, etc. then at least 4 pairs should be used.