[PD] urn no end

[juto aviten]

Hello Friends,
I just would like to know if some of you already works with urn which a 
good object but when it finish to make it's job, it's just simply stop!!

for example if you put urn 120, it will explore all the possibilities in 
this number and whel it will finish it will just stop, my questions is 
how we could loop his work?
Random just simply do that, it repeats the number but not urn...

thanks for your help!

best

juto