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#include <stdio.h> int main() { unsigned int num; scanf("%u",&num); for (unsigned int j = num ; j > 0 ; j--) { // defining variables unsigned int sum = 0; // loop to get all proper divisors // it is sufficient to loop until num/2, because after that there will not be other proper divisors! for (int i = 1; i <= j / 2; i++) { if (j % i == 0) // if the number can be divided by the current divisor 'i' sum += i; // then add 'i' to the running sum } // at the end of the loop, check if num is equal to sum if (j == sum) printf("%u\n",j); } }
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