C :

#include<stdio.h> 
void wanmeishu(int n){
	int i,c=1;
	for(i = 2;i <= n / 2;i++){
		if(n % i == 0){
			c += i;
		}
	}
	if(c == n){
		printf("%d ",n);
	}
}

int main(){ 
	int m,n,i;
	scanf("%d %d",&m,&n);
	for(i = m;i <= n;i++){
		wanmeishu(i);
	}

	return 0;
} 

C++ :

#include<iostream>
#include<cmath>
using namespace std;


bool WanMeiShu(int n);

int main(){
	
	int a,b;
	cin>>a>>b;
	
	for(int i=a;i<=b;i++){
		
		if(WanMeiShu(i)){
			cout<<i<<" ";
		}
	}
} 

bool WanMeiShu(int n){
	
	int s;
	int j;
	s=1; 
	
	
	for(int i=2;i<=sqrt(n);i++){
		if(n%i==0){
			s=s+i;
			j=n/i;
			
			if(i!=j){
				s=s+j;
			}
				
		}
	}
	
	if(s==n)
		return true;
	else
		return false;
	
}

Pascal :

var m,n,i,j,s:longint;
begin
readln(m,n);
for i:=m to n do
 begin
  for j:=2 to round(sqrt(i)) do
  if i mod j = 0 then s:=s+j+i div j;
  if s+1=i then write(i,' ');
  s:=0; 
 end;
writeln;
end.

Java :

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		
		for(int i = a;i <= b;i++) {
			int sum = 0;
			for(int k = 1;k < i;k++) {
				if(i % k == 0) {
					sum += k;
				}
			}
			if(sum == i) {
				System.out.print(i + " ");
			}
		}
	}
		
		
}	

Python :

import math;
def wanmeishu(n):
   s = 0;
   for i in range(1,n):
      if n % i == 0:
         s += i;
   return s == n;

a,b = map(int,input().split());
for i in range(a,b+1):
       if wanmeishu(i) == True:
              print(i);