Your calculations are for a tiny piece of the map. Factorio worlds are infinite. So "the chunk-distance between any two chunks" cannot be precomputed.

And Factorio worlds are not static. So even if you could precompute, you'd have to recalculate the whole thing every time a player places a wall, destroys cliffs, fills water, puts a new building, destroys a biter nest or a biter builds a new nest.