Lindsey Creek tree close to twice the size of the largest living single-stem tree, the giant sequoia known as General Sherman. Skip Johnson, a Fieldbrook logger interviewed in 1971, testified that he witnessed the Lindsey Creek Tree after it was lying on the ground. He reported it as the tallest tree in Fieldbrook. He stated that a family member measured its diameter at 19 feet at 130 feet off the ground, and 9.5 feet at 260 feet off the ground, and its total height slightly exceeded 390 feet. If true, it was taller than any other known tree. Hyperion, another coast redwood (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