It is not a mathematical system, it is a particular mathematical pattern that is noted and quite possibly the cited examples are cherry picked.

I don't know offhand if any of the authors of that era would have been likely to know about the underlying mathematical concepts. I don't know if this is consistently applied to every person mentioned in an OT genealogy along with their age, or if it's being force-fitted or contrived.

What I do know is:

1. Biblical numerology is a big deal for some folks, both those trying to gin up credibility for the Bible based on pseudoscience, and those trying to find hidden / esoteric / symbolic meaning. All examples of it I've ever looked into thus far have constituted confirmation bias.

2. People didn't live longer at any time in the past than they do now; if anything, they tended to live shorter, nastier lives. Inflating their ages is just a way of making these figures larger than life.

So meh.

I do believe there are a number of clues that the bible is fiction, but I'm not sure if they were intentional or not.

Hey wait no....
Enoch never died at all, he was taken up so (0 times 0 squared)= 0 Never died, that proves it, yayh me

I think a few bored scribes probably got drunk on Kosher wine one night and sneering and nudging one another said
"This is really going to freak out some clever dick rabbi in 4000 years time who will probably waste his whole life trying to read some stupid esoteric significance into it hahahahahaha Hic"

Well I personally believe that their ages have been distorted due to assumptions that whoever wrote these numbers down were going by a Roman calendar year instead of the actual time for which these people lived.

Meaning that instead of year being based off of 12 months which didn’t begin to be in use until around 700 ad that possibly that age was based off of seasonal changes like in Abraham’s time there were 3 seasons.

So divide 3 into 175 and you get 58 which would actually equate to a more accurate age based off the lifespans recorded of other people in that region and during that time ( which were 45-72 )

But this just theory as well since the documentation of timelines weren’t consistent nor were they always clearly marked by lunar cycles like certain civilizations.

I think whoever wrote those passages has a poor understanding of astronomy, doesn't know how long a year is, and was exaggerating.

Perhaps if you wrote those years in binary another mathematical coincidence occurs.

On a lighter note Jacob’ age of 147 is the same as a maximum break in snooker, therefore perfection. Does this mean that Jacob was brilliant at snooker, or that he was good at ‘snookering’ situations, I.e able to influence for his own purposes? ...and on it goes. Just an example of how this system could be used. Very entertaining I hope you agree!?

Most of the Old Testament was written down after the Babylonian exile. You’ll find that much of the early Judaic tradition comes out of the cultural melting pot of Chaldea. The culture was very big on numbers like the 12 base system and squared numbers that is still used today For example 12 x 5 = 60 (mins, hours), 6 x 60 = 360 (degrees in a circle), They also introduced Gematria, the system whereby if words have the same numerical value they mean the same thing. So all numbers in some contexts in their writings have allegorical meanings. Well worth the study if you have the time.

I think it's an awful lot bullshit.
There are no gods.
Abraham, Issac, and Jacob are all just fictional characters in a fictional book.
Trying to use mathematics to "prove" the existence of god is laughable.