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
Spoiler-free review of #ProjectEuler problem 349 (Langton's Ant). I enjoyed this easy problem very much. Do not, under any circumstances, search the internet for the term "Langton's Ant" or you will be spoiled and the problem will be ruined for you!
Recommended: https://projecteuler.net/problem=349
Spoiler-free review of #ProjectEuler problem 153 (Investigating Gaussian Integers): this is a nice medium-difficulty problem. You don't need to know much theory (the things I remembered from my elementary number theory course 9 years ago were certainly sufficient, or you can read the "basic definitions" section of the Wikipedia article without getting any spoilers), but there are some nice insights to be figured out.
Recommended: https://projecteuler.net/problem=153
Spoiler-free review of #ProjectEuler problem 772 (Balanceable k-bounded partitions): not my favorite problem; it's easy for all the wrong reasons and I was almost a bit upset when I saw the green checkmark.
Spoiler-free review of #ProjectEuler problem 539 (Odd Elimination): I really liked this one, it's not too difficult but a lot of fun to work out on pen and paper. You can *almost* solve it entirely without a computer but the numbers get a bit large. I solved it on my phone (might be the first one I did without a computer?) and accidentally called the solution while trying to copy it out.
Recommended: https://projecteuler.net/problem=539
Was going to do Stuff today but we started doing #ProjectEuler with @Daffodil and I had to redo all my old solutions. Got up to 11.
Still ashamed that my fancy segmented sieve didn't work for the 10001sth prime. 
Can't sleep, my solution for problem 11 doesn't work. I've solved this 10 years ago already, why can't I solve it now with a BSc in my bag. 