import java.util.ArrayList; import java.util.Scanner; public class SuperEfectNumber { public static void main(String[] args) { Scanner in = new Scanner(System.in); int input=in.nextInt(); // the assumption is that the input is a positive number of int type in.close(); for (int i=2; i<=input;i=i+2) { // change according to @Nika's advice that superefect numbers are allways even ArrayList divideList=getDividersArray(i); // get dividers list of number i int sum1=getSumOfDividers(divideList); // get sum (sum1) of divideList ArrayList divideListOfSum=getDividersArray(sum1); // get dividers list of sum1 int sum2=getSumOfDividers(divideListOfSum); // get sum (sum2) of divideListOfSum if(i*2==sum2) { // check last condition and display it if is true System.out.print("\nSuperefect number is: "+i+ getParOfString(divideList, sum1) + getParOfString(divideListOfSum, sum2) + " = "+ i +"*2" ); } } } private static ArrayList getDividersArray(int i) { ArrayList divListLocal=new ArrayList(); for (int j=1; j<=i;j++) { if (i%j==0) divListLocal.add(j); } return divListLocal; } private static int getSumOfDividers(ArrayList divideList) { int sumLocal=0; for(int j=0; j divideList, int sum) { String str = ""; for(int j=0; j "+str.substring(0, str.length()-1) +"="+sum; } }

Challenge SuperEfectNumber