Only three solutions are possible from base 6 to base 1000. These are::
Base 10: 27^2 + 36^2 = 45^2
Base 14: 58^2 + 76^2 = 94^2 --> decimal 78^2 + 104^2 = 130^2
Base 16: 5A^2 + 78^2 = 96^2 --> decimal 90^2 + 120^2 = 150^2
The minimum base, N, is therefore: 10.
For an explanation, refer to the solution submitted by Larry in this location.
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