fork download
copy 
  1. #include<stdio.h>
  2.  
  3. int main(){
  4.     int c=0;
  5.     int a[33];
  6.     int k,s,u;
  7.     s=0;
  8.  
  9.     a[0]=2;
  10.     a[1]=-1;
  11.  
  12.     for(int i=0;i<31;i++){
  13.         a[i+2]=0-a[i+1]+a[i]+2;
  14.     }
  15.  
  16.     for(k=0;k<=32;k++){
  17.         c=0;
  18.         if (a[k] <= 1) continue;  
  19.  
  20.         for(u=2;u<a[k];u++){
  21.             if(a[k]%u==0) c++;
  22.         }
  23.  
  24.         if(c==0) s++;
  25.     }
  26.  
  27.     printf("%d",s);
  28.     return 0;
  29. }
Success #stdin #stdout 0.03s 5308KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
7
https://ideone.com/7VyELj
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!