Little Isabella and re-opened to the fanfare music of Onchan Silver Band. Since this time it has operated sporadically in conjunction with train services on the nearby railway, but, following storms in October 2002, it was damaged and has subsequently been a purely static exhibit. Little Isabella Little Isabella is a rustic water wheel, situated in Groudle Glen on the Isle of Man, that was originally built in 1893 with the arrival of the Manx Electric Railway to the glen. It has been dubbed the "Little Isabella" owing to its alleged resemblance to the Laxey Wheel in nearby Laxey which was opened
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