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;
	
}

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);