SS Ellan Vannin (1883) SS Ellan Vannin (1883) SS (RMS) (the Manx name for the Isle of Man) was built as an iron paddle steamer in 1860 at Meadowside, Glasgow for the Isle of Man Steam Packet Company. She was originally named "Mona's Isle" - the second ship in the Company's history to be so named. She served for 23 years under that name before being rebuilt, re-engined and renamed in 1883. As "Ellan Vannin" she served for a further 26 years before being lost in a storm on 3 December 1909 in Liverpool Bay. "Mona's Isle" was built by Tod and McGregor Ltd,
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