How many maths nerds does it take to defeat the German Tank corps?

Interesting story on How Allied Forces Used Tank Serial Numbers To Defeat The Germans at

Allied intelligence noticed each captured German tank contained a serial number unique to the tank. With careful observation, the Allies were able to determine that the serial numbers had a pattern denoting the order of tank production.

Using this data, the Allies were able to create a mathematical model to determine the rate of German tank production, and estimated that, during the same summer 1940 to fall 1942 time period, the Germans produced 255 tanks per month — a fraction of the 1,400 estimate.

And it turns out, the serial number methodology was spot on: after the War, internal German data put der Fuhrer’s production numbers at 256 tanks per month — one more than the estimate.

The answer to the question in the post title? A division, obviously.