Sum of the first 792 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 792 square numbers, you ask? Here we will give you the formula to calculate the first 792 square numbers and then we will show you how to calculate the first 792 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 792 square numbers, we enter n = 792 into our formula to get this:

		792(792 + 1) × (2(792) + 1)
		6

First, calculate each section of the numerator: 792(792 + 1) equals 628056 and (2(792) + 1) equals 1585. Therefore, the problem above becomes this:

		628056 × 1585
		6

Next, we calculate 628056 times 1585 which equals 995468760. Now our problem looks like this:

		995468760
		6

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

995468760 ÷ 6 = 165911460

There you go. The sum of the first 792 square numbers is 165911460.

You may also be interested to know that if you list the first 792 square numbers 1, 2, 9, etc., the 792nd square number is 627264.

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