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Exercise5_26.java
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47 lines (40 loc) · 888 Bytes
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public class Exercise5_26 {
public static void main(String[] args) {
System.out.println("Print the first 100 palindromic primes: ");
int count = 1;
for (int i = 2; true; i++) {
if (isPrime(i) && isPalindrome(i)) {
//System.out.printf("%4d", i);
System.out.print(i + " ");
if (count % 10 == 0) {
System.out.println();
}
if (count == 100) {
break;
}
count ++;
}
}
}
public static boolean isPrime(int num) {
int division;
for (division = 2; division <= num / 2; division++) {
if (num % division == 0)
return false;
}
return true;
}
public static int reversal(int num) {
int result = 0;
int digits;
while (num != 0) {
digits = num % 10;
result = result * 10 + digits;
num = num / 10;
}
return result;
}
public static boolean isPalindrome(int num) {
return num == reversal(num);
}
}