Prime numbers two units apart.

In number theory, a formula for primes is a formula generating the prime numbers, exactly and without exception.

This was proved by Leonhard Euler in 1737, and strengthens Euclid's 3rd-century-BC result that there are infinitely many prime numbers and Nicole Oresme's 14th-century proof of the divergence of the sum of the reciprocals of the integers (harmonic series).

In computational number theory, a variety of algorithms make it possible to generate prime numbers efficiently.

the debut studio album by Canadian musician Grimes.