Go figure. The new largest known prime number, discovered using a computer running prime-seeking software, was found by multiplying 2 by itself 77,232,917 times and then subtracting 1. Written in shorthand as M77232917, it’s almost 1 million digits longer than the last confirmed prime. It took the computer six days to find and 291 hours to verify, but landed Jonathan Pace, an electrical engineer in Tennessee, $3,000 (and everlasting glory) for the discovery. Experts estimate it may take 15 years to hit the 100 million-digit milestone.