A 'perfect number' is one in which the factors of a number (apart from the number itself) add up to the number. Thus, 6 is a perfect number because its factors are 1, 2, 3, and 1 + 2 + 3 = 6.

It is an unsolved problem in mathematics if there are an infinite number of perfect numbers.

See Wikipedia: Perfect Numbers

The Perfect numbers less than 1,000,000 (plus one):

Nth number | Perfect |
---|---|

1 | 6 |

2 | 28 |

3 | 496 |

4 | 8,128 |

5 | 33,550,336 |

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