Pythagorean Number

Triplets of integers which satisfies the equation "x^2 + y^2 = z^2".
"3, 4, 5" is well known.

Generally speaking,

x = m^2 - n^2, y = 2mn, z = m^2 + n^2 (m and n are integers).

Take "m = 1, n = 2", we get "3, 4, 5".

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