A000040 (OEIS entry for Prime numbers)

A000040 is the sequence of prime numbers listed in order: 2, 3, 5, 7, 11, 13, and so on. Primes are numbers greater than 1 that have no divisors other than 1 and themselves. They are fundamental building blocks in mathematics because every whole number can be broken down into primes. The sequence helps mathematicians study the distribution and properties of primes. Despite their simple definition, prime numbers appear irregularly along the number line, which makes them both fascinating and important in various fields, including cryptography and number theory.