I'm trying to get a handle on how compound numbers are written. I'm looking at Smyth §347.

http://www.ccel.org/s/smyth/grammar/htm ... 2n_uni.htm

Is the following summary accurate?

Compound numerals (13-19; 21-29; 31-39;....) are normally connected with και (except 11, 12), with no intervening space (except 13 & 14), and with the smaller numeral coming first (21 can be inverted).

The only examples of inverted numbers is 21 which can be EIS KAI EIKOSI or EIKOSI (KAI) EIS. Is 21 the only inverted number, or are other numbers (e.g. in the twenties or 1-4 compounds formed similaly to 21? I.E, the following statement is false? yes/no?: [The numbers one through four (EIS - TESSARES) may follow the larger number; when this happens they are written with or without the και (e.g. 21 EIKOSI EIS). ]

Louis Sorenson