Maybe,indeed.
Maybe the numbers resembles something perhaps binary?Or it could mean every three letters,words,phrases,etc.
I actually read a book with a puzzle similar to this years ago.
I'll use my common retarded sense as a last resort.
EDIT—I did a bit of "research" and found that you might need to have some (psh mor than some) knowledge behind the pre-Christian and Mayan time/history.