Laxey Mine ton, and this would be used to glaze lower end earthenware. During the height of prosperity of the Great Laxey Mine, the Laxey Wheel was erected. The wheel was named the Lady Isabella, after the wife of Sir Charles Hope, who at the time was the Lieutenant Governor of the Isle of Man. During its working life the wheel was capable of pumping 250 gallons of water a minute from a depth of 200 fathoms. By the beginning of the 20th Century the yield from the mine had begun to decline dramatically. During the first six months of 1900 the
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