Having just received the details for naxt year's UK 'Filk' convention Quinze I am reminded that the French count up to 16 using single word numbers 1Un 2deux 3trois 4quatre 5cinq 6six 7sept 8huit 9neuf 10dix 11onze 12douze 13treize 14quatorze 15quinze 16seize
This seems even more strange as they clearly use base 10 for numbers above 16 17dix-sept 18dix-huit 19dix-neuf