Loops: Special Pythagorean triplet

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Special Pythagorean triplet

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Problem 9
A Pythagorean triplet is a set of three natural numbers, a < b < c, for which,

a^2 + b^2 = c^2
For example, 3^2 + 4^2 = 9 + 16 = 25 = 5^2.

There exists exactly one Pythagorean triplet for which a + b + c = 1000.
Write a program, SpecialPy_YI.py to find the product abc.