The online computer game “Is this prime?” tests a player’s knowledge of prime numbers—and just surpassed 2,999,999 attempts. Give it a whirl. The Greek mathematician Euclid may very well have proved, ...

Prime numbers are a central topic of study in math. Despite being an object of fascination for millennia, there are still a lot of unsolved problems involving primes. Prime numbers are one of the most ...

NPR asked the typographers at Hoefler & Frere-Jones to estimate how long this Mersenne prime would be if typed out -- all 12,987,189 digits. The answer, it turns out, depends not only on the font but ...