Third time’s a charm: just weeks after cracking an elusive problem involving the number 42, mathematicians have found a solution to an even harder problem for the number 3. Andrew Booker at ...

The Luhn algorithm—also known as the “Modulus 10 algorithm”—is a formula used to determine the accuracy of credit card numbers.

But Helfgott, 38, went even farther back in time and conceived an improved version of the sieve of Eratosthenes, a popular method for finding prime numbers that was formulated circa 240 B.C ...

Prime numbers are whole numbers greater than 1 that are not divisible by any whole number other than 1 and itself. The first few are 2, 3, 5, 7, 11, 13 … ...