[tuliptree76]

Huh?

[Irish_Thatcherite]

Hexadecimal - base 16 numbers, instead of 0 - 10, you get 0 - 16.

0 ¦ 0
1 ¦ 1
2 ¦ 2

.....

9 ¦ 9
10 ¦ A
11 ¦ B
12 ¦ C
13 ¦ D
14 ¦ E
15 ¦ F
16 ¦ 10
17 ¦ 11