As a counter-example , considering the non-square - free n = 60 , the greatest common divisor of 30 and its complement 2 would be 2 .
Divisor should be the bottom divisor 1 .
As a counter-example , considering the non-square - free n = 60 , the greatest common divisor of 30 and its complement 2 would be 2 , while it should be the bottom element 1 .