Challenge – Even Fibonacci numbers

Do you like solving puzzles as much as myself and my Demcon colleagues?
Then I got a challenge for you: can you solve Even Fibonacci numbers?

If you succeed, you have a chance to win a raspberry pi 5!

Send in your answer before 1 January 2024.

I wish you good luck!
Pieter Bijleveld – Senior Software Engineer at Demcon

Read the full challenge below.


Pieter Bijleveld

Senior Software Engineer at Demcon

The challenge

Each new term in the Fibonacci sequence is generated by adding the previous two terms.
By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …

By considering the terms in the Fibonacci sequence whose values do not exceed four million,
find the sum of the even-valued terms*.

  • Write your solution as efficiently as possible in one of the following languages: Python, C++, or C#.
  • Please add information (in the README) on how to execute the code.
  • We will evaluate your solutions based on inventiveness, efficiency, and good coding practices.
  • We will only accept submissions in the form of a link to a Github repository.
  • Please submit to
  • We’ve added some instructions below if you’re unfamiliar with Github.

The raspberry pi 5 will not be awarded to employees of Demcon. However, they do have a chance to win a raspberry pie. 😉

  1. In your internet browser, navigate to
  2. Enter your email address, and press ‘sign up for GitHub’
  3. Press continue, create a password and enter a username
  4. Solve the puzzle to show that you are a human
  5. Verify your email address and customize your Github experience
  6. Create a new project by pressing ‘start a project’
  7. Give your repository a name, and make sure it is set to public. Press ‘create repository’
  8. In quick startup, press ‘create new file’ or ‘upload existing file’
  9. Enter the code for this challenge here
  10. When you are ready to submit, go to the <>code section of your repository and press ‘code’ and copy the HTTPS link. Enter this link into your submission.

* This problem is taken from Project Euler.