The best book on the subject of Gemetria in antiquity and Christianty is, Jesus Christ Sun of God" by David Fideler. He points out in painful detail how the story of hauling in the 153 fish in John 21 is a classic piece of gemetria. This late addition to John (it formerly ended with chapter 20) demonstrates that 2nd century Christians were familiar with the "art" and felt it divine. His book is the first to recognise the Mark 6:30 feeding of the 5000 as another example of Gemetria. This story appears to be an earlier piece, tho some today feel the book of Mark was composed 100-130 from an UrMark (protoMark)and elements from Luke and Matt. So this MAY suggest that the earliest Christian writers were Gemetria students. This is however not certain as I said the book of Mark appears itself to be influenced by the other Synoptics. Anyone interested in this stuff MUST read this book. No hocus pocus no wild speculation, just the facts.