Prime numbers: A refresher. Some numbers are prime, like 5 and 173. This means they can only be divided by 1 and themselves. Most numbers are not prime, like 6, which can be divided by 2 and 3.

Prime numbers are a central topic of study in math. Despite being an object of fascination for millennia, ... The prime number written in decimal as 31 is written in binary as 11111.

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

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

If you do this with all numbers from 2 to 100, only prime numbers will remain. Sieving multiples of 2, 3, 5 and 7 leaves only the primes between 1 and 100. Courtesy of M.H. Weissman ...

Prime numbers (2, 3, 5, 7, 11, 13, ... Mathematics has an unlimited number of prime number building blocks. Euclid proved this more than 2,000 years ago with a simple thought experiment.

Featured Math Trek column: The Great Internet Mersenne Prime Search, a cooperative computing project, helps find a prime that has nearly 13 million digits.

The online computer game “Is this prime?” tests a player’s knowledge of prime numbers—and just surpassed 2,999,999 attempts. Give it a whirl.

Prime Numbers: The Most Mysterious Figures in Math David Wells. John Wiley & Sons, $24.95 (272pp) ISBN 978-0-471-46234-7 ...

An amateur mathematician from San Jose, US, has discovered the largest prime number yet with over 41 million digits. Prime numbers, the building blocks of mathematics, are divisible only by ...