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 the progression of the largest known prime number in ascending order. Here M = 2 − 1 is the Mersenne number with exponent "n". The longest record-holder known was M = 524,287, which was the largest known prime for 144 years. No records are known before 1456. GIMPS found the fourteen latest records (all of them Mersenne primes) on ordinary computers operated by participants around the world. A list of the 5,000 largest known primes is maintained by Chris K. Caldwell, of which the twenty largest are listed below. Largest known prime number The largest known prime number () is