Official A Nightmare On Math Street Discussion

Official discussion thread for A Nightmare On Math Street. Please do not post any spoilers or big hints.

Fun challenge, if you need some tips DM me on Discord: mathysEthical#1861

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It’s my 2nd challenge on this category…
This challenge has no file to download.
Just start instance and get ip:port and Go!
WHAT nc … nothings response back … wait a few second … → refuse connection …!!!
I saw a title “Math” Ahhhh it’s clue …
try nc then 9+9 … … (silence) … ah it’s not complete
try 999 = 801 … … (silence) … ah I gave wrong answer
try 2^10 = 1024 … … (silence) … ahhhh It’s maybe python
… and … WTF my receive ip why it’s longer than i use to nc ??? ahhhh It’s my fault
555 This challenge is good to play. It’s mathematic.

Does this require some external code to interact with the target or am I missing something here?