Answer Posted / srikanthgowda

#include<iostream>
#include<stdlib.h>
#include<math.h>
using namespace std;

int main()
{

int n,a[100];
cout<<"Enter size of the array"<<endl;
cin>>n;

cout<<"Enter the any value in 3digit format"<<endl;
for (int i=0;i<n;i++)
cin>>a[i];

for (int i=0;i<n;++i)
{

if((a[i]/100)>10)
{
cout<<"invaild"<<endl;
exit(0);
}
}

cout<<"Vaild within 3idigit number"<<endl;


int temp=pow(2,a[n-1]);
temp=temp+1;
cout<<temp;
int count=0;
for(int i=1;i<=1000;i++)
if( (temp)%i == 0 )

{
count++;
}


if (count==2)
{
cout<<endl<<temp<<"-->%2^n+1%"<<"is prime number"<<endl;
}
else
{
cout<<endl<<temp<<" is not primre number
";
}


return 0;
}

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