Project Euler Problem 1: Multiples of 3 and 5

Project Euler is a website with a collection of challenging computational problems intended to be solved with computer programs. In this series, I will work on solving these problems using Python.

Problem 1 starts real easy. It asks us to find the sum of all the multiples of 3 or 5 below 1000. This can be easily solved using the modulo operator %. The modulo operator returns the remainder of the euclidean division of the two operands. For example, 10 % 3 returns 1 because 10 = 3 * 3 + 1.

We can use this operator to check if a number is a multiple of another number. If n % 3 == 0, then n is a multiple of 3. Then we can iterate over all numbers below 1000 and sum the ones that are multiples of 3 or 5.

s = 0
for i in range(1000):
    if i % 3 == 0 or i % 5 == 0:
        s += i

print(s)

You can find all my solutions in my GitHub Repository!.

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