The two square numbers with a difference of 21 are 25 and 4. This is because (5^2 = 25) and (2^2 = 4), and their difference is (25 - 4 = 21).
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The two numbers are 21 and 7.
1 and 20.
The two numbers are 4 and 17.
5 & 21
The numbers are 11 and 10.