Pi Day Is Upon Us Again and We Still Do Not Know if Pi Is Normal
David H. Bailey, Jonathan Michael Borwein · American Mathematical Monthly · 2014
The digits of π have intrigued both the public and research mathematicians from the beginning of time. This article briefly reviews the history of this venerable constant, and then describes some recent research on the question of whether π is normal, or, in other words, whether its digits are statistically random in a specific sense.