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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. int i=0,j,a[100],count=0,c;
  5. a[0]=2;
  6. a[1]=-1;
  7. for(i=0;i<=32;i++)
  8. {
  9.   a[i+2]=-a[i+1]+a[i]+2;
  10.     c=0;
  11.     for(j=1;j<=a[i];j++)
  12.     {
  13.       if(a[i]%j==0){
  14.         c++;
  15. 	  }
  16. 	}
  17. 	if(c==2){
  18. 	count=count+1;
  19. 	}
  20. }
  21. printf("%d個\n",count);
  22. 	return 0;
  23. }
  24.  
  25.  
Success #stdin #stdout 0.04s 5260KB
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7個
https://ideone.com/PrttCI
language:
C (gcc 8.3)
created:
188 days ago
visibility:
public

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