The word "SIX" can be spelled with six matchsticks (if you'll forgive my "S").
What is the next whole number n that can be spelled (in English, in all capital letters) with exactly n matchsticks?
You shall not break a match in two, nor redundantly double up matches on the same edge of a letter. You may, however, take advantage of glyph variants like one-stick sans-serif "I" versus three-stick seriffed "I".