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  1. #include <stdio.h>
  2. int main(void) {
  3.     int a[33];
  4.     int n=0,i,count,sum=0;
  5.     a[0]=2;
  6.     a[1]=-1;
  7.     while(n<=30){
  8.     	a[n+2]=-a[n+1]+a[n]+2;
  9.     	n++;
  10.     }
  11.     for(n=0;n<=32;n++){
  12.     	sum=0;
  13.     	if(a[n]>0){
  14.     		for(i=1;i<=a[n];i++){
  15. 				if(a[n]%i==0){
  16. 					sum++;
  17. 				}
  18. 			}
  19. 			if(sum==2){
  20. 				count++;
  21. 			}	
  22.     	}
  23.     }
  24.  
  25.     printf("%d",count);
  26. 	return 0;
  27. }
  28.  
Success #stdin #stdout 0.03s 5264KB
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https://ideone.com/KQVlim
language:
C99 (gcc 8.3)
created:
111 days ago
visibility:
public

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