64 + 16
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8081 can be the sum of two perfect squares because its perfect squares are 41 x41+80x80=1681+6400. Answer=1681+6400
It is Fermat's theorem on the sum of two squares. An odd prime p can be expressed as a sum of two different squares if and only if p = 1 mod(4)
85
The two numbers are 9 and 13.
There is no single number here. The two seed numbers are 5 and 6; their squares sum to 61.