Coffee: Here’s the latest largest prime number
Rafi Letzter at LiveScience tells us it is called M77232917 (represented in digits, in art, below): Its only factors are itself and the number 1. That’s what makes it prime. So how big is this number? A full 23,249,425 digits long — nearly 1 million digits longer than the previous record holder. If someone started writing it down, 1,000 digits a day, today (Jan. 8), they would finish on Sept. 19, 2081, according to some back-of-the-napkin calculations at Live Science. … Primes that are one less than a power of 2 belong to a special class, called Mersenne primes. The smallest Mersenne prime is 3, because it’s prime and also one less than 2 times 2. Seven is also a Read More ›