Recently, we received two project Euler questions:
I won't claim they are off-topic here. In fact, they often make exemplary Mathematica questions. However, I feel it goes against the spirit of project Euler to answer those questions here. The project is a large set of programming puzzles paired with a forum per question, open to anyone who has already solved a given puzzle. The project Euler spirit is all about DIY and learn from that, or solve it badly, go to the forum and learn from there.
We shouldn't be providing an open forum where anyone can scoop up the recipes.