Numeric Value: 13

The folowing table expresses '13' in various number bases. 'DR_x' shows the result of 'digit reducing' resulting in an X-digit long number.

Base	DR₄	DR₃	DR₂	DR₁
2	1101		11,10	1
3		111	10	1
4			31,10	1
5			23,10	1
6			21	3
7			16,10	1
8			15	6
9			14	5
10			13	4
11			12	3
12			11	2
13			10	1
14				D
15				D
16				D

Math World

Factors: Prime

13 is the 7th Fibonacci number.

13 is in the Pythagorean Triples: (5, 12, 13), (13, 84, 85).

8,191 is the 6th Mersenne number (p=13).

8,191 is the 6th Mersenne number (p=13).

8,191 is the 6th Mersenne number (p=13).

A 'Triskaidecagon' is a 'regular polygon' with 13 sides.

Physical World

13 is the atomic weight of Aluminium (Al).

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