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That highlights my main issue with the format of project Euler and why I abandoned it. If you happen to know the area of maths that the question requires it can be challenging but fairly straightforward. If you don't, it's incredibly difficult or next to impossible and there aren't many (if any) clues about HOW you could gain enough background knowledge to solve it. All discussions about a particular problem, methods or maths tools to help solve it are locked away in the forum and you need to have solved it already before you can read it. if you never took linear algebra class it would be unlikely to occur to you" type of tip.