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- int kpn(int a, int b, int k)
- {
- int d,s;
- for(;a<=b && k!=0; a++)
- {
- s=0;
- for(d=1; d*d<a; d++)
- if(a%d==0)
- s+=d+a/d;
- if(d*d==a)
- s+=d;
- if(a%2==s%2)
- k--;
- }
- a--;
- if(k==0)
- return a;
- else
- return -1;
- }
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