An effort in which thousands of people donate their computers' unused processing power uncovers the largest prime number so far known. Stephen Shankland worked at CNET from 1998 to 2024 and wrote ...

There are three kinds of prime numbers. The first is a solitary outlier: 2, the only even prime. After that, half the primes leave a remainder of 1 when divided by 4. The other half leave a remainder ...