Sum of the first 793 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 793 square numbers, you ask? Here we will give you the formula to calculate the first 793 square numbers and then we will show you how to calculate the first 793 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 793 square numbers, we enter n = 793 into our formula to get this:

		793(793 + 1) × (2(793) + 1)
		6

First, calculate each section of the numerator: 793(793 + 1) equals 629642 and (2(793) + 1) equals 1587. Therefore, the problem above becomes this:

		629642 × 1587
		6

Next, we calculate 629642 times 1587 which equals 999241854. Now our problem looks like this:

		999241854
		6

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

999241854 ÷ 6 = 166540309

There you go. The sum of the first 793 square numbers is 166540309.

You may also be interested to know that if you list the first 793 square numbers 1, 2, 9, etc., the 793rd square number is 628849.

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