Are these "long equidistant letter sequences" based on numerical analysis of the text?
They are literally messages embedded at equidistant spacing through most of the Old Testament. The content of the sealing messages is in each case directly related to the content of the surface text, proving beyond a shadow of doubt that they are not in any way random occurances. Read Ed Sherman's "Bible Code Bombshell" to get the full impact of the protection these seals place on the word. They make the Bible scientifically unassailable.