Configure XTerm for 3456x2160 @ 225% display

I am running a Dell XPS 15 9530 with a display running at 3456x2160 @ 225%. I want to try XTerm as a terminal emulator but the font size is really small. I have tried adjusting it with menus but I cannot get it large enough. I believe I need to create a configuration file to fix this. Can someone explain how to fix this using the xterm config file?

No one uses Xterm anymore?

This pretty much fixes it:

wiking@walhalla:~$ cat .Xresources 
xterm*font:  10x20
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