Is it this: https://en.wikipedia.org/wiki/Travelling_Salesman_(2012_film) ?
I kind of understand the downvotes (it's not particularly educational, and only incidental to common LW interests), but I don't agree. I'm happy to see even tangentially-related things that make rationalists smile.
There's an SF movie on Amazon Prime called "Traveling Salesman", done somewhat in the style of "Twelve Angry Men", about the P=NP hypothesis. It's high on drama rather than explanation, but the sheer existence of such a thing makes me happy. Thought this group might appreciate it.