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The sum of the squares of the first ten natural numbers is,

12 + 22 + … + 102 = 385

The square of the sum of the first ten natural numbers is,

(1 + 2 + … + 10)2 = 552 = 3025

Hence the difference between the sum of the squares of the first ten natural numbers and the square of the sum is 3025 − 385 = 2640.

Find the difference between the sum of the squares of the first one hundred natural numbers and the square of the sum.

**Script**

Execution Time: 0.0013 seconds

$sum = 0; $squareSum = 0; for($x = 1; $x<=100; $x++) { $sum += $x; $squareSum += ($x*$x); } $diff = $squareSum-($sum*$sum); echo abs($diff).PHP_EOL;

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