Sum of the first 764 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 764 square numbers, you ask? Here we will give you the formula to calculate the first 764 square numbers and then we will show you how to calculate the first 764 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 764 square numbers, we enter n = 764 into our formula to get this:

		764(764 + 1) × (2(764) + 1)
		6

First, calculate each section of the numerator: 764(764 + 1) equals 584460 and (2(764) + 1) equals 1529. Therefore, the problem above becomes this:

		584460 × 1529
		6

Next, we calculate 584460 times 1529 which equals 893639340. Now our problem looks like this:

		893639340
		6

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

893639340 ÷ 6 = 148939890

There you go. The sum of the first 764 square numbers is 148939890.

You may also be interested to know that if you list the first 764 square numbers 1, 2, 9, etc., the 764th square number is 583696.

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