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.

Our current love affair with primes notwithstanding, many people have wondered whether this is all just abstract theoretical stuff or whether prime numbers have real-world applications.

The amateur mathematician found the new largest prime number dubbed “M136279841”, calculated by multiplying together 136,279,841 twos, and then subtracting 1.