Erekle Roinishvili

This is a problem from Project Euler programming puzzles.

Problem 6
Sum square difference

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.

What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20?

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