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Javascript (3837)
a=prompt();while(a%2==0a>1)a/=2;alert(a==1)
Simple script that just divides by 2 repeatedly and checks the remainder.
Javascript (38)
a=prompt();while(a%2==0)a/=2;alert(a==1)
Javascript (37)
a=prompt();while(a>1)a/=2;alert(a==1)
