US engineer discovers the largest ever prime number
A US-based electrical engineer has discovered the largest known prime number, having as many as 23,249,425 digits. The 51-year-old mathematics enthusiast arrived at the number by subtracting 1 from 2 to the power of 77,232,917, proving which took six days of PC computing. The new result of Mersenne primes is nearly a million digits longer than the previous record holder.