Sum of the first 755 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 755 square numbers, you ask? Here we will give you the formula to calculate the first 755 square numbers and then we will show you how to calculate the first 755 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 755 square numbers, we enter n = 755 into our formula to get this:

		755(755 + 1) × (2(755) + 1)
		6

First, calculate each section of the numerator: 755(755 + 1) equals 570780 and (2(755) + 1) equals 1511. Therefore, the problem above becomes this:

		570780 × 1511
		6

Next, we calculate 570780 times 1511 which equals 862448580. Now our problem looks like this:

		862448580
		6

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

862448580 ÷ 6 = 143741430

There you go. The sum of the first 755 square numbers is 143741430.

You may also be interested to know that if you list the first 755 square numbers 1, 2, 9, etc., the 755th square number is 570025.

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