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You simply add three consecutive integers (for instance 1,2,3 or 25,26,27) and take the square.

Example: (12+13+14)2 = 392 = 1521.

Or generally: (n + (n+1) + (n+2))2, where n is the first integer.

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14y ago
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Q: What is the square of the sum of three consecutive whole numbers?
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