1, 4, 9, 16, 25, 36. These are the perfect squares from 1 to 40.
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4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
1, 4, 9, 16, 25, 36
1, 4, 9, 16, 25, 36
-39
4 (the square of 2) and 36 (the square of 6) add up to 40.