It may be that it wraps earlier for me too, i was just too lazy to check.
Lessee:
alt-100:d
alt-356:d
hehe, there I go again with stupid assumptions (and we all know what assumptions do . . . ) I shoulda figured that it would wrap there when I saw that it used the 8000s and 9000s for #s in the 1-256 range.

oops.
I wonder where the &# wraps though. I think its probably 65536, since its clearly not 256. Unless it does something weird and uses only part of a byte --- riiiiiiight.
I was just wondering if the ALT- method actually does comply with some standard, because there are a few smaller/older standards out there . . . a lot of the chars it produces are old DOS "graphic" characters, tree lines, borders, etc. (Yay DOS! wheeeee!) There must have been a standard for that.
I think I'll see if Linux and Macs have a similar character shortcut (well, sort of see, by trial and error, so i guess i can only prove a positive) I'm assuming that all of the people posting the Alt- stuff are Windows Users, since Macs don't have Alt, and there aren't many Linuxers out there.