SS Ellan Vannin (1854) small shop and various donations were made. At their Annual General Meeting of 17 December 1856, it was passed that the Castletown Steam Navigation Company should donate £10 to this cause. (equivalent to £ in ) 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
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