base decode

From The K Language Wiki
Base decode
x/y

base decode or just decode takes an integer y and decodes it into a digit array using the bases in x. It performs the inverse of base encode.

If x is an atom, decodes the number fully, using x as many times as needed.

 2 2\5
0 1
 2\5
1 0 1
 24 60 60\1000
0 16 40