Unity UI Show text after each iteration while keeping the previous text from the previous iteration

So I am having trouble with text output. I cannot figure out how to keep the text from the previous while loop iteration so that instead of overriding the text box the next text output for the next iteration just moves to a new line. This is the code
This is what actually happens. But I want this to happen instead.

 

outputtext += ?

 

Yea I figured it out. Completely forgot that in order to append text you need to use a += operator I kept using = and I realized that the text kept getting overridden but I could not find anywhere on what operator to use to not override the previous value.