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// 2a.cpp
#include <iostream>
#include <iomanip>
using namespace std;
void criba(int * p, int n);
int main() {
int numeros[2019];
for (int j = 0; j < 2019; ++j) numeros[j] = j + 2;
criba(numeros, 2020);
}
void criba(int * p, int n) {
for (int j = 2; j*j <= n; ++j) {
if (p[j-2] > 0) {
for (int k = 0; j*j + k*j <= n; ++k)
p[j*j + k*j - 2] = 0;
}
}
for (int j = 2; j <= n; ++j) {
if (p[j-2] > 0) {
cout << setw(6) << j << " esta en la posicion " << p+j-2 << endl;
}
}
}
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