New Largest Known Prime Number Has More Than 23 Million Digits

iStock
iStock

Prime numbers come in all sizes: They go down to single digits and grow infinitely larger. But calculating the exact quantity of the largest prime numbers in existence takes serious time and effort. Now, thanks to help from a volunteer and his computer, the Great Internet Mersenne Prime Search (GIMPS) has identified the newest largest prime number we know of.

The prime number has 23,249,425 digits, surpassing the previous record holder by 1 million digits. It can be written as 277,232,917-1 or M77232917. Like other prime numbers, the quantity can only be divided by one and itself. But unlike some smaller primes, this one joins a special category called Mersenne primes.

Mersenne primes are found by calculating numbers to the second power and subtracting the value of one from the total. Only 50 prime numbers have been found this way, and a lot of computing power is required to uncover them.

Since 1996, GIMPS has been crowdsourcing computers to discover larger and larger prime numbers. Anyone can download their program and dedicate their unused processing power to churning out algorithms in search of the next record breaker. Volunteers whose computers successfully identify a new prime number are eligible for a cash reward of up to $3000.

The most recent winner was Jonathon Pace, a 51-year-old electrical engineer from Tennessee. His computer calculated the number M77232917 on December 26, and its prime status was independently verified by four separate computers.

GIMPS is constantly outdoing itself, with the previous largest prime announced just two years ago. If you'd like to join the effort, their prime-hunting software is free to download. But don't expect instant results: Pace was volunteering with GIMPS for 14 years before his altruism paid off. 

Wednesday’s Best Amazon Deals Include Computer Monitors, Plant-Based Protein Powder, and Blu-ray Sets

Amazon
Amazon
As a recurring feature, our team combs the web and shares some amazing Amazon deals we’ve turned up. Here’s what caught our eye today, December 2. Mental Floss has affiliate relationships with certain retailers, including Amazon, and may receive a small percentage of any sale. But we only get commission on items you buy and don’t return, so we’re only happy if you’re happy. Good luck deal hunting!

PBS Will Air A Charlie Brown Thanksgiving and A Charlie Brown Christmas, Saving the Holiday Season

Charlie Brown and friends ready for a feast.
Charlie Brown and friends ready for a feast.
Apple TV+

Last month, it was announced that the Peanuts holiday specials for Halloween, Thanksgiving, and Christmas wouldn’t air on network television this year, breaking a tradition that began more than 50 years ago. Instead, they’d be available to stream on Apple TV+. Even though non-subscribers would be able to view the programs for free on certain dates, the news still caused a small uproar across social media.

Now, PBS is here to save the day. As Deadline reports, Apple TV+ has given the channel permission to air A Charlie Brown Thanksgiving (1973) and A Charlie Brown Christmas (1965) once each, without ads. PBS and PBS KIDS will broadcast A Charlie Brown Thanksgiving on Sunday, November 22, at 7:30 p.m. EST; A Charlie Brown Christmas will follow a few weeks later on Sunday, December 13, also at 7:30 p.m. EST. Not only will the broadcasts help foster a collective holiday spirit at a time when families might not be physically together, but they’ll also give people without access to Apple TV+ an opportunity to enjoy the specials.

Though the shift to streaming upset some Peanuts fans, it’s not the first time that the rights have changed hands. CBS originally produced and premiered the holiday specials beginning in the 1960s, but they gave the reins to ABC in the early 2000s. Whether the PBS broadcast will become a new annual tradition remains to be seen; in the meantime, all Peanuts content, new and old, will live on Apple TV+.

If you can’t catch the holiday specials on PBS this year—and if you can access Apple TV+—feel free to stream A Charlie Brown Thanksgiving for free from November 25 to November 27, and A Charlie Brown Christmas from December 11 to December 13.

[h/t Deadline]