King Arthur (tree) King Arthur (tree) The King Arthur Tree is a giant sequoia located in Garfield Grove, the grove is near the town of Three Rivers in California. The tree was once known as the California Tree, as shown in National Park Service promotional literature from 1917 (which describes the largest tree in Garfield Grove as the "California Tree"). The King Arthur is the ninth largest giant sequoia in the world. Its base of up to about 50 feet (15 m) rivals the General Sherman, the largest giant sequoia, for total mass. The Garfield Grove comprises 2,330 acres (9.4 km) in Sequoia
Largest known prime number Largest known prime number The largest known prime number () is 2 − 1, a number with 23,249,425 digits. It was found by the Great Internet Mersenne Prime Search (GIMPS) in 2017. Euclid proved that there is no largest prime number, and many mathematicians and hobbyists continue to search for large prime numbers. Many of the largest known primes are Mersenne primes. , the seven largest known primes are Mersenne primes. The last sixteen record primes were Mersenne primes. The fast Fourier transform implementation of the Lucas–Lehmer primality test for Mersenne numbers is fast compared to other known primality tests