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PandigitalPrime.java
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PandigitalPrime.java
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package devjava;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class PandigitalPrime {
static boolean isPrime(int factor) {
int counter = 0;
for (int i = 1; i <= Math.sqrt(factor); i++) {
if (factor % i == 0) {
counter++;
}
if (counter >= 2) {
return false;
}
}
return true;
}
static List<Integer> generateAllPandigitals() {
int n = 7;
List<Integer> outList = new ArrayList<>();
for (int i = n; i >= 1; i--) {
for (int k = n; k >= 1; k--) {
if (k == i) {
continue;
}
for (int j = n; j >= 1; j--) {
if (j == k || j == i) {
continue;
}
for (int z = n; z >= 1; z--) {
if (z == k || z == i || z == j) {
continue;
}
for (int m = n; m >= 1; m--) {
if (m == k || m == i || m == j || m == z) {
continue;
}
for (int h = n; h >= 1; h--) {
if (h == k || h == i || h == j || h == z || h == m) {
continue;
}
for (int y = n; y >= 1; y--) {
if (y == k || y == i || y == j || y == z || y == m || y == h) {
continue;
}
outList.add(
Integer.parseInt(i + "" + k + "" + j + "" + z + "" + m + "" + h + "" + y));
}
}
}
}
}
}
}
Collections.sort(outList, Collections.reverseOrder());
return outList;
}
public static void main(String[] args) {
for (int i : generateAllPandigitals()) {
if (isPrime(i)) {
System.out.println(i);
break;
}
}
}
}