SS Ellan Vannin (1854) her general exterior being similar to the "Countess of Ellesmere." In fact she was built very much after the model of that vessel, but with the additional requirements to adapt her for sea-going purposes in the challenging conditions around the Isle of Man. Clinker built, "Ellan Vannin" was rigged as a two mast steamer with two white painted funnels and with a full length female figurehead sitting on a rock adorned with a castellated crown. "Ellan Vannin" was well appointed for the carriage of passengers with accommodation for 91 First Class and 195 Second Class. Her after saloon was in
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