OK, I deleted all these duplicates. How convenient for us they all used unique words; "Diophantine" is also good.
https://stackoverflow.com/questions/3050882/diophantine-equation-closed
https://stackoverflow.com/questions/3050475/solving-diophantine-equations-using-python
https://stackoverflow.com/questions/3046564/problem-solving-in-python-program-closed
I guess we can thank their teacher for that courtesy!
Edit: wow, this is a much more serious problem than I realized. I count DOZENS (literally, dozens!) of accounts spamming us with the same bad python assignment questions. Two IP ranges, both map to Universities in India.
Laying down wide IP bans:
# incredibly abusive indian university homework, dozens of accounts
# spamming the same gratuituous homework questions
-A INPUT -s 210.212.0.0/16 -j DROP
-A INPUT -s 218.248.0.0/16 -j DROP
(specifically 218.248.5.222 and 210.212.222.90)
Also destroying many, many accounts.