Android Distributed Prime Calculator: Gamified
Install the app on your devices, preferably get a friend to do the same. Keep on clicking the find prime buttons and see who can get the most points by calculating primes faster!
The way it works is that whoever calculates a prime sends it to the server on the backend (powered by Firebase - firebase.com). Whoever finds the Nth prime first gets N^2 points awarded for their contribution. Any user who joins the game does not need to recompute primes, but just pulls it automatically from the server to cache it locally.