[LINUX][XTERM] Keypad '/' generates 'o' ?

[Dario Niedermann]

I have a notebook with an embedded numeric keypad (requiring the Fn key
to form numbers). In a few programs (Vim, rTorrent, traditional Vi) when
the TERM environment variable is set to 'screen', the keypad's "slash"
key (Fn + minus) generates an "o" (or possibly an ESC-o, judging from
Vi[m]'s behaviour). 

GNU Screen doesn't need to be running for this to happen, setting TERM
to 'screen' does it. This makes me think that Screen's termcap entry is
somehow broken, although I'm using one that Screen itself generated (via
dumptermcap).

So... Is there a good termcap entry I can use with GNU Screen, or a way
to get the keypad's "slash" key to work well?

Some versioning:

screen --version:       "Screen version 4.00.03 (FAU) 23-Oct-06"
xterm -version:         "X.Org 6.8.99.903(241)"
Xorg -version:          "X.Org X Server 1.4.2"

TIA!