Simple Autoit Script help

Alright so obviously i have no idea what I'm doing. Was trying to make a simple script that would just simply spam 345 etc till the end where it gets to 6 and then repeat itself. However it doesn't work in game. If i run it while it is in a normal window (such as wordpad) it'll work and will spam the numbers accordingly until i hit the Esc key

This is what i have so far, I've never made a script before, so as i said i have no idea what I'm doing.

Sleep(4000)
Opt("SendKeyDownDelay", 55)

While 100000
Send( "{3}" )
Sleep(2500)
Send( "{4}" )
Sleep(2500)
Send( "{5}" )
Sleep(2500)
Send( "{3}" )
Sleep(2500)
Send( "{4}" )
Sleep(2500)
Send( "{5}" )
Sleep(2500)
Send( "{3}" )
Sleep(2500)
Send( "{4}" )
Sleep(2500)
Send( "{5}" )
Sleep(2500)
Send( "{3}" )
Sleep(2500)
Send( "{4}" )
Sleep(2500)
Send( "{5}" )
Sleep(2500)
Send( "{3}" )
Sleep(2500)
Send( "{4}" )
Sleep(2500)
Send( "{5}" )
Sleep(2500)
Send( "{6}" )
Sleep(50000)
Send( "{6}" )
Sleep(3000)
WEnd

Func quit()
Exit
EndFunc

So yeah, i would really appreciate it if someone would take a look at it and help me fix it. Thanks in advance