Whoops!

(Sorry bout that.) I guess I ended the campaign!

At the least, it illustrates how tough it is for a small d20 publisher to get someone to edit his work.
Anyway, as I said, it wasn't something that could have been solved by us given the limited information Roman had given (not that he could have known). Obviously, ruishlight and Algolei were on the right track before I ever chimed in but without Roman actually knowing the answer, and how little he actually knew about what it would take from that stage to get to the answer, there was no way for him to do what the DM would have done and given an additional clue at that stage to get them over the hump. If he had had the answer, or been the DM, that thread would likely have ended a few posts after rushlight hit on the prime, odds, and even thing.
Still sounds like there some dispute between Roman and his DM regarding clues or bypasses in a treasure that Roman is saying was an illusion and the DM is saying wasn't? What's that all about?
I tell you what, though. Next time someone posts a puzzle, I'm going to first ask if they, themself, know the answer. If they say, "No" then I'll be leaving that thread further untouched. It's simply too frustrating when you don't know if something can even be solved, or if you do solve something and not having someone who can say that it is so.