Welcome Teamwork71!!
I'm pretty new too but have learned much. This is the place!!
Use the search field for 434 workout by Blackapple. That way you learn from the person who developed it.
The filter you are referring to is called Ultimate pick 3 filter by Justawiner. Please do the same for it.
What I do a little different is I combine the numbers indicated from the pick 3 filter with the 434 workout.
Any number duplicated by the 434 to the ult. pick 3 I use as a prime number. So even though the pick 3 filter gives more than one digit, I only use the digit or digits matching the 434. Any digit of which there is two or more occurrence's in the 434 workout is a prime number. the bottom two rows I use as an indicator for the root to play.
After you do it it a few times you'll see what I mean.
For more info on roots ,sums and how to use them, read the posts written by Blackapple. He is a master.