When you say
>
> start with a base number, say 75, and add
You mean base as in the starting number and not base as in base16 or
base24 or base75?
If that's the case:
put 75 into theNum
repeat with x = 18 down to 1
add x to theNum
if theNum > 254 then
exit repeat
end if
end repeat
put theNum
Kee