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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main() {	
  6. 	unsigned long long M;
  7. 	cin >> M;
  8.  	for (unsigned long long n = 4; n <= M; n += 2) {
  9.  		unsigned long long S = 1;
  10. 	    for (unsigned long long j = 2; j <= sqrt(n) && S <= n; j++) {
  11. 			if (n % j == 0) S += n / j + j;
  12. 		}
  13. 		if (n == S) cout << n << " ";
  14. 	}
  15. 	return 0;
  16. }
Success #stdin #stdout 3.02s 3472KB
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stdin
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2000000
stdout
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6 28 496 8128
https://ideone.com/sDDW9A
Совершенные числа 1
language:
C++14 (clang 8.0)
created:
7 years ago
visibility:
public

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