Hey, who did you interview and for what position? And how many of these people succeeded? I've solved about 50 project Euler problems, but only 1 or 2 with number above 200. I'm not a genius, didn't study maths, but it's imho quite hard to solve any Euler problem at an interview, even if you're a decent thinker. Ok, there are few easy ones, but none of these with 3 digit numbers.