If you have a negative voltage like say -20V and you want to get it down to -17V (or technically this is up since -17 is greater than -20) would you use the LM337 in this case?

The current would be about 10mA - 13mA in my project with an absolute maximum of 20mA if that matters.

I found a LM337 calculator and it seems that if I use values of 160Ω for R1 and 2KΩ for R2 then I will get about -17V output if I am understanding it correctly.

I already ordered some resistors. For the 2K resistor I got one that is rated for 1-watt of power since that same page said it would need to handle 123 mW and I figured I should be safe. For R1 the calculator only says it will need to handle 9.7 mW so I figured the standard 1/4 watt resistor should be fine. Please let me know if what I am saying is correct or if I am making wrong assumptions. Thanks.