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This question already has an answer here:

Number which can be expressed as sum of two squares in two different ways -
e.g - a). $85 = {2^2} + {9^2} = {6^2} + {7^2}$
b). $125 = {2^2} + {11^2} = {5^2} + {10^2}$
I do not need more example. I just need way/formulas. So, Can anyone tell me the way/formulas through which I can find infinitely many such numbers?

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marked as duplicate by José Carlos Santos, Glorfindel, Antonios-Alexandros Robotis, user91500, Namaste Aug 12 '17 at 12:02

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