Problems with crontab

[Lowell Gilbert]

"cell" <bettan at nerim.net> writes:

> Hello , i have problem with crontab , i tried to configure crontab for run command every three days at 5h00 AM.I use this command but i believe it's not good :
> 
> 0       5       1-31/3  *       *       root    cd /home/rootfix/Maildir/cur && rm -f *
> 
> 
> Anyone have a solution ?

What is the actual problem?  It looks like it will work fine.
[on the first, fourth, etc.]