Web Reference: Find the sum of all the multiples of or below . Let A be the multiples of 3 up to n, and let B be the multiples of 5 up to n. Their intersection, A ∩ B, is the multiples of 15 up to n. Thus, we can solve the problem by summing the multiples of 3, adding the sum of the multiples of 5, and subtracting the sum of the multiples of 15. Apr 7, 2023 · In the beginning one can use a brute force approach and always succeed. But when one progresses through the problems, they will become impossible to solve with brute force in a decent amount of time. In this article I will take a look at Problem 1: Multiples of 3 or 5:
YouTube Excerpt: Project Euler Problem
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Last Updated: April 8, 2026
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