function keys in a telnet session

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I am trying to use a telnet product called QVT/Term by www.qpc.com
This attaches to the AS400 and believes it has negotiated a vt220 session.
It supports DDE with another program, permitting a user written C program
to read and write to the AS400 session. This all works fine.
Fuction keys F1 - F10 (as defined in ANSII), are of the form
<esc>[nn~ 
where for  F1-F10, nn is 11,12,13,14,15,17,18,19,20,21
it was fairly easy to extend this to get the escape sequences for
F11-F20, nn is 23,24,25,26,28,29,31,32,33,34
However the codes for F21 to F25 continue to elude me.
Can anyone help?
 

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function keys in a telnet session - help