Connecting to the remote input gives RSA values:
```nc jh2i.com 50013Generating public and private key...Public Key in the format (e,n) is: (65537,31378393096163)The Encrypted PIN is 26169559602561What is the PIN?```
FactorDB fully factors public key (n, 31378393096163). That gives p and q. Then just do standard RSA with those values and send back pin (3093)
[Full writeup](https://bigpick.github.io/TodayILearned/articles/2020-06/nahamConCTF-writeups#twinning)