That brought the known number of people murdered by Tobin to seven.

He had found 157 species of vascular plants, which more than doubled the known number.

Currently, the known numbers for which all three conditions hold are: 3, 5, 7, 13, 17, 19, 31, 61, 127.

But with the lifts off, a stranger could spend hours checking every door, even to find a known number.

The known number of cases then was fewer than 220.

It is also the largest known prime number as of January 2013.

I don't even know what I need to buy to get a list of all known numbers in this class.

An eye surgeon in Germany has discovered the world's largest known prime number - or at least his computer did.

To date, the largest known prime number equals 2 1.

This was the second-largest known prime number, and it remained so until 1911.