A sequel to The Numberphile Heist (part 1)
You hear a click, and a slight push reveals the entrance. Looking at what's inside, you laughed at your own naïvety.
Instead of a mountain of brown paper, you're faced with merely another vault. On the door is a QWERTY keypad, and a plaque:
Gosh darnit, Brady protects his brown paper well. Unfazed, you try to figure out what the code could be.