SS Ellan Vannin (1854) the £14,000 reputed to have been available in 1856) a sum which the directors and shareholders present would not accept. Again the "Ellan Vannin" resumed revenue service whilst further attempts were made to find a buyer. The "Ellan Vannin's" final excursion took her across to the coast lines of County Louth and County Down via Carlingford Lough on 25 June, before she left the Isle of Man for good. Finally the Directors of the Castletown Steam Navigation Company (by now in serious financial difficulties) managed to find a buyer. "Ellan Vannin" was sold to Cunard & Wilson who were acting
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