Might want to check your math.
If your numbers are as written, and a "K" suffix is NOT there, you should get 423, not 423000.
BTW, I don't have a Gecko manual and merely recalc'd your math. Thus, if the resistance was expressed in thousands of ohms (K ohms) you probably need to say so to avoid confusion to us non-manual challenged responders.
If K is not there, it is 423 ohms or something reasonably close. If "K" suffix was there and you left it out, it is 423K ohms.
You can use resistors in series or parallel to get the EXACT 423 or 423K ohm value you want. Any electronics handbook will explain how to do series or parallel resistor summing problems.