Code it up

The Problem Archive

Mathematics you can only half-remember becomes mathematics you own the moment you make a computer do it. Each problem has a single answer. Work it out however you like, in Python on your machine or right here in the browser, then submit it.

In the spirit of Project Euler: every problem is solvable in well under a minute of computing, answers are checked against a fingerprint (never stored in plain text), and the worked solution unlocks once you're right.