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Oct 18th, 2019
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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5. int k;
  6. for (k = 2; k < 200000; k++)
  7. {
  8. if (isPrime(k))
  9. {
  10. printf("X");
  11. } else {
  12. printf("O");
  13. }
  14. }
  15. }
  16.  
  17. int isPrime(int number)
  18. {
  19. int i;
  20. for (i = 2; i < number; i++ )
  21. {
  22. if (number % i == 0)
  23. {
  24. return 0;
  25. }
  26. }
  27. return 1;
  28. }
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