# Euler Project #6: Difference of Square of Sums and Sum of Squares

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The sum of the squares of the first ten natural numbers is, 1^2 + 2^2 + … + 10^2 = 385

The square of the sum of the first ten natural numbers is, (1 + 2 + … + 10)^2 = 55^2 = 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.

// sumOfSquares: 338350 // squareOfSums: 25502500 // diff: 25164150 var sumOfSquares = 0 var squareOfSums = 0 for x in 1...100 { sumOfSquares += x*x squareOfSums += x } sumOfSquares squareOfSums *= squareOfSums let diff = squareOfSums - sumOfSquares