π = (10 - 3/23)^{1/2} = 3.1415864
π = (31 + 1/155)^{1/3} = 3.1415985
π = (97 + 9/22)^{1/4} = 3.14159265
π = (306 + 1/51)^{1/5} = 3.14159250