Already solved the #4TechChallenge for this month? Here’s a bonus question to keep your mind in challenge mode:
Why do no prime numbers have digits that sum to 15?
Post your methods and solutions in the comments below and look out for the answers next month.
What's the answer?
For those of you that had a crack at the bonus question our justification is here:
If you've enjoyed this quiz, have a look at this Forensic Technology Challenge and keep your eye on the blog for more quizzes to come.