Sum of the first 170 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 170 square numbers, you ask? Here we will give you the formula to calculate the first 170 square numbers and then we will show you how to calculate the first 170 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 170 square numbers, we enter n = 170 into our formula to get this:

		170(170 + 1) × (2(170) + 1)
		6

First, calculate each section of the numerator: 170(170 + 1) equals 29070 and (2(170) + 1) equals 341. Therefore, the problem above becomes this:

		29070 × 341
		6

Next, we calculate 29070 times 341 which equals 9912870. Now our problem looks like this:

		9912870
		6

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

9912870 ÷ 6 = 1652145

There you go. The sum of the first 170 square numbers is 1652145.

You may also be interested to know that if you list the first 170 square numbers 1, 2, 9, etc., the 170th square number is 28900.

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