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- void sum_div_prim(int n ,int &s)
- {
- int i,j,cod;
- s=0;
- if(n%2==0)
- s=s+2;
- for(i=3;i*i<=n;i=i+2)
- {
- cod=1;
- for(j=3;j*j<=i;j=j+2)
- if(i%j==0)
- cod=0;
- if(cod==1)
- s=s+i;
- if(n/i!=i)
- {
- cod=1;
- for(j=3; j*j<=n/i && cod==1; j=j+2)
- if((n/i)%j==0)
- cod=0;
- if(cod==1)
- s=s+n/i;
- }
- }
- }
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