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May 20th, 2018
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  1. #include <stdio.h>
  2. #include <math.h>
  3. int SoHoanHao(int n)
  4. {
  5. int S=1;
  6. for (int i=2; i<=sqrt(n); i++)
  7. {
  8. if(n%i==0)
  9. {
  10. S+=i;
  11. if(n/i!=i)
  12. S+=n/i;
  13. }
  14. }
  15. if (S==n)
  16. return 1;
  17. else
  18. return 0;
  19. }
  20.  
  21. int main()
  22. {
  23. int n;
  24. scanf("%d", &n);
  25. for (int i = 2; i <= n; i++) {
  26. SoHoanHao(i) ? printf("%d ", i) : printf("");
  27. }
  28. return 0;
  29. }
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