Sum of the first 747 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 747 square numbers, you ask? Here we will give you the formula to calculate the first 747 square numbers and then we will show you how to calculate the first 747 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 747 square numbers, we enter n = 747 into our formula to get this:

		747(747 + 1) × (2(747) + 1)
		6

First, calculate each section of the numerator: 747(747 + 1) equals 558756 and (2(747) + 1) equals 1495. Therefore, the problem above becomes this:

		558756 × 1495
		6

Next, we calculate 558756 times 1495 which equals 835340220. Now our problem looks like this:

		835340220
		6

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

835340220 ÷ 6 = 139223370

There you go. The sum of the first 747 square numbers is 139223370.

You may also be interested to know that if you list the first 747 square numbers 1, 2, 9, etc., the 747th square number is 558009.

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