How to find teichmuller representation of 2 (for example)

["Eric J. Van der Velden" <ericjvandervelden@gmail.com>]

Hi,

In Z5 I found the teichmuller representatives

0

1

i=2121...

-i=3323...

-1

By 2121... I mean 2+1*5+2*5^2+1*5^3+...

I can write

2 = i(-1)(-i)0... = i - 5 - i*5^2 + 0*5^3 + ...

How can I find in gp this representation of 2 ?

Thanks