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# Prime number

A prime number is a positive integer that has no factors apart from one and itself. $1$ is not considered to be a prime number.

$2$, $3$ and $5$ are prime numbers.

$6$ is not a prime number because it has factors $2$ and $3$.

There are infinitely many prime numbers. The first ones are

$$2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,\dots$$
These cicadas hatch in a 17 year lifecycle - a prime number. This means that predator lifecycles are less likely to overlap, and so more cicadas survive.