The "Bible Codes" book and others of its ilk were pretty comprehensively debunked, but that doesn't mean there aren't numeric codes in the Bible. Since ancient times, Jews have ascribed numbers to each letter of the alphabet and certain numbers have had special significance. You can defintely find letter->number transpositions that had numerological significance in the Old Testament as well as written sequences of numbers that had special significance (examples: "Forty Days and Forty nights", the unlikely grand-old ages of some of the Patriarchs), they just aren't the random sequences "discovered" using simple algorithms in those books.