SS Ellan Vannin (1854) SS Ellan Vannin (1854) SS (RMS) "Ellan Vannin" was an iron-built packet steamer which was operated out of Castletown, Isle of Man for the Castletown Steam Navigation Company (also referred to as the Castletown Steam Packet Company) to Liverpool and Whitehaven. Her name, Ellan Vannin, came from the Gaelic term by which the Isle of Man is known. "Ellan Vannin" was built by John Laird and Co. Ltd, Wallasey Pool, Birkenhead and was launched by Mrs. H. Houldsworth at 13:00hrs on Saturday 24 June 1854. Length 170'; beam 21' (exclusive of the paddle boxes) 39' overall. "Ellan Vannin" was powered
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