Prime numbers, vital in mathematics and competitive exams, can be quickly identified using a systematic approach. This method ...

Large prime number enthusiasts’ next two challenges are to identify the first 100 million-digit and 1 billion-digit primes. EFF prizes of US$150,000 and $250,000, respectively, ...

A history of prime numbers. Informally, a positive counting number larger than one is prime if that number of dots can be arranged only into a rectangular array with one column or one row. For ...

(The prime number 13, for instance, can be written as 2 2 + 3 2.) Leonhard Euler later proved it. But tweaking the question just a little bit — say, by insisting that one of the numbers you’re ...

The world's largest known prime number has been discovered, but we can't show it because it's so large it would take up 21 standard-sized novels to turn into text. Called M136279841, it comes to ...

Find one million consecutive positive numbers, none of which are prime.