Pi (1998)

A paranoid mathematician named Max searches for a key number that will unlock the universal patterns found in nature. He believes that everything in nature can be understood through numbers and that by graphing numbers properly, patterns will emerge. As Max delves deeper into his obsession, he is plagued by severe headaches, hallucinations, and extreme paranoia. With the help of a homemade supercomputer and a group of researchers, Max discovers a mysterious 216-digit number that holds incredible power. However, he becomes the target of shadowy agents who want to use his discoveries for financial gain. Max's journey takes a dark turn as he struggles to understand the true nature of the number and the consequences it may have on his own sanity.