send CTRL-& mapping to vim

[Teto]

Hi,

I am trying to map in vim CTRL+& CTRL+é CTRL+" (equivalent to
CTRL+1/2/3 on a qwerty keyboard). I followed this "tutorial"
http://www.mail-archive.com/rxvt-unicode@lists.schmorp.de/msg01218.html
which worked on CTRL+é and CTRL+" but not on CTRL+&. When I do "cat
-V" and press CTRL+& I get "&" whreas if I press CTRL+é I get
^[[27;5;130~ as expected



Here is a subset my .Xdefaults:
! &
URXvt.keysym.Control-0x26: \033[27;5;38~
! é
URxvt.keysym.Control-0xe9: \033[27;5;130~
! "
URxvt.keysym.Control-0x22: \033[27;5;34~
! '
URxvt.keysym.Control-0x27: \033[27;5;39~

Any idea why and how to solve this please ?

Regards

Matt