Wait, which list? The problem has two numbers, P and Q, which run through all primes up to 50k.

I agree with the rest. Really, idiots that know only one solution... OTOH, better to detect them early in the process. I just wonder how, e.g. a Chinese guy interviews and Indian guy, and vice versa. Have to pay closer attention next time. Two different kinds of logic. (Europeans too have this problem, different logic.)