Sum of the first 758 square numbers

We define square numbers as numbers that when squared will equal a whole number. Thus, the list of the first square numbers starts with 1, 4, 9, 16, and so on.

What is the sum of the first 758 square numbers, you ask? Here we will give you the formula to calculate the first 758 square numbers and then we will show you how to calculate the first 758 square numbers using the formula.

The formula to calculate the first n square numbers is displayed below:

		n(n + 1) × (2(n) + 1)
		6

To calculate the sum of the first 758 square numbers, we enter n = 758 into our formula to get this:

		758(758 + 1) × (2(758) + 1)
		6

First, calculate each section of the numerator: 758(758 + 1) equals 575322 and (2(758) + 1) equals 1517. Therefore, the problem above becomes this:

		575322 × 1517
		6

Next, we calculate 575322 times 1517 which equals 872763474. Now our problem looks like this:

		872763474
		6

Finally, divide the numerator by the denominator to get our answer:

872763474 ÷ 6 = 145460579

There you go. The sum of the first 758 square numbers is 145460579.

You may also be interested to know that if you list the first 758 square numbers 1, 2, 9, etc., the 758th square number is 574564.

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