In high school, I had to learn to program mostly on my own. One of the resources I used to challenge me was the Commodares programming challenges from Ahoy! magazine. Every month there would be a few small programming challenges, and readers would be challenged to send in solutions.
I always worked on these and occasionally sent in solutions. Since I found the Commodore magazine archives, I've been digging through them trying to find some of my old solutions, and I think this may have been the only one of mine to make it to print. I've found at least one other mention, but none in print.