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May 28th, 2015
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  1. #include <cstdio>
  2.  
  3. int a[100000000];
  4. int main(){
  5. int b,c,d;
  6. for(b=2;b<100000000;b++){
  7. if(a[b]==0){
  8. for(d=2;d*b<=100000000;b++){
  9. a[b*d]=1;
  10. }
  11. }
  12. }
  13.  
  14. printf("Digite entero positivo o 0 para terminar\n");
  15. while(scanf("%d",&b) && b!=0){
  16. printf("Los primos menores o iguales a %d son:\n",b);
  17. for(c=2;c<=b;c++){
  18. if(a[c]==0){
  19. printf("%d\n",c);
  20. }
  21. }
  22. printf("Digite entero positivo o 0 para terminar\n");
  23. }
  24. }
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