Twin Primes
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Basic Info
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Discovered by | |

Number of | |

Description | p and p+2 are both primes. |

First Few | (3, 5), (5, 7), (11, 13), (17, 19) |

**Twin primes **are numbers wherein two numbers have a gap of two. According to Wikipedia, there are 808,675,888,577,436 twin prime pairs below 10^18, or 1 quintillion. Can you find all of those?

## Examples

3 and 5 are twin primes

5 and 7 are twin primes

11 and 13 are twin primes, et al.

## Largest known twin prime

3756801695685 · 2^666669 ± 1.

## See also

- Cousin Primes, wherein the gap is four.
- Sexy Primes, wherein the gap is six.