in which episode of star trek did spock ask a computer to calculate the last digit of pi

In Star Trek: The Original Series , Spock asks the computer to calculate the last digit of pi in the episode “Wolf in the Fold” (Season 2, Episode 14).

He issues a Class A compulsory directive to the Enterprise computer — “Compute to the last digit, the value of pi” — to overload the system while it is possessed by the evil entity Redjac.