Perhyte

Try exiting it and then make sure no tmux process is still running, by for example running ps -aux | grep tmux.

For future reference: the command to kill the tmux daemon (and as a side-effect, all other running tmux processes connected to it) is tmux kill-server (or in tmux, typing <prefix> :kill-server, assuming default keybindings).

And MATLAB appears to produce 51, wtf idk

The numeric value of the ‘1’ character (the ASCII code / Unicode code point representing the digit) is 49. Add 2 to it and you get 51.

C (and several related languages) will do the same if you evaluate '1' + 2.