The folowing table expresses '4' in various number bases. 'DR_{x}' shows the result of 'digit reducing' resulting in an X-digit long number.

Base | DR_{3} | DR_{2} | DR_{1} |
---|---|---|---|

2 | 100 | 1 | |

3 | 11 | 2 | |

4 | 10 | 1 | |

5 | 4 | ||

6 | 4 | ||

7 | 4 | ||

8 | 4 | ||

9 | 4 | ||

10 | 4 | ||

11 | 4 | ||

12 | 4 | ||

13 | 4 | ||

14 | 4 | ||

15 | 4 | ||

16 | 4 |

Factors: 2^{2}

4 is in the Pythagorean Triple: (3, 4, 5).

4 is the number of vertices in a Tetrahedron.

4 is the number of faces in a Tetrahedron.

A 'Square (or Tetragon)' is a 'regular polygon' with 4 sides.

4 is the atomic weight of Beryllium (Be).

Mars is the 4th planet in our solar system. See Planets.

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