Pentekaideca = Quintus decimus = the 4th discrete semiprime
I got this rather intriguing black letter yesterday.
Inside was some kind of Chinese numbers puzzle with some Latin at the bottom. Pentekaideca = Quintus decimus = the 4th discrete semiprime.
Anyhow, it all leads to 15. Delivered on the 15th…so I goggled it and found at least one other who got the same type of letter. But after that, no clue…
Someone looking for a job? Or…here’s the links I found. I’ll keep you posted…
http://www.kontain.com/david/entries/77196/we-will-solve-anything-you-send-us/
http://www.kontain.com/david/entries/77193/does-anyone-know-what-this-is-or-who-sent-this-secret-letter-to-me/