The factors of 21 are 1, 3, 7, and 21. 3 - 1 = 2
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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).
119
Factors of 21: 1, 3, 7, 21 Factors of 2: 1, 2 GCF (21, 2) =
63? But it has more than two one-digit factors.
6 and 8 1 and 3 2 and 4 4 and 6