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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	// your code goes here
  5. 	int a[100],i,j,k,n;
  6. 	a[0]=2;
  7. 	a[1]=-1;
  8. 	n=0;
  9. 	for(i=0;i<=31;i++){
  10. 		a[i+2]=-a[i+1]+a[i]+2;
  11. 		k=0;
  12. 		if(a[i]>0){
  13. 			for(j=1;j<=a[i];j++){
  14. 				if(a[i]%j==0)k++;
  15. 			}
  16. 		if(k==2)n++;
  17. 		}
  18. 	}
  19. 	printf("%d ",n);
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0.02s 5288KB
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https://ideone.com/dhcxXU
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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