A community for technology geeks in Lebanon.

You are not logged in.

Signup Challenge

In order to sign-up, you need to solve this challenge.

Find the sum of the multiples of 13 or 7 under 775

Too hard? Here's a detailed example:

Find the sum of the multiples of 3 or 5 under 16

Walk through each number from 0 to 15
For each number, check if it is a multiple 3 or 5 or both.
If it is, take note of that number. If it is not, ignore it.

At the end of this process, you should get: 3, 5, 6, 9, 10, 12, 15
The sum of those numbers is: 3+5+6+9+10+12+15 = 60
The solution is therefore 60.

Note: If you refresh the page, you will get a new exercise.

Board footer