2026-04-13 20:23 UTC
Spoiler-free review of #ProjectEuler problem 757 (Stealthy Numbers): this is a nice little problem with a nice solution. It made me feel quite stupid because it took me a while to solve it despite its difficulty rating of 3/39. I don't really understand these difficulty ratings. I know they are computed from the solve statistics, so they are "objective", but I just cannot see how 349 is an 11/39 if 757 is a 3/39.
Recommended: https://projecteuler.net/problem=757
Replies (1)
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@juhi@hachyderm.io 2026-04-14 17:55
I have a theory for the difficulty mystery: Problem 757, like many other PE problems, has the property that you can just brute force the first few terms of the sequence and then plop them into OEIS to get some major hints or possibly a full solution. Personally I would never do this because it takes most of the fun out of these problems, but I know that a lot of people consider OEIS fair game.