rad is the radical of a number [1]. In short rad(x) is the product of all unique prime factors of x. So rad(8) = 2, rad(24) = 6, rad(75) = 15 [1] https://en.w

rad is the radical of a number [1]. In short rad(x) is the product of all unique prime factors of x. So rad(8) = 2, rad(24) = 6, rad(75) = 15 [1] https://en.wikipedia.org/wiki/Radical_of_an_integer https://en.wikipedia.org/wiki/Radical_of_an_integer