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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args)
  11. 	{
  12. 		Scanner sc=new Scanner(System.in);
  13. 		int num=sc.nextInt();
  14. 		  int res=largestPrimePalindrom(num);
  15. 		  System.out.println(res);
  16. 	}
  17. 	 public static int largestPrimePalindrom(int num){
  18.  
  19.         for(int i=num; i>1;i--){
  20.              if(isPrime(i)){
  21.                 if( isPalindrom(i)){
  22.                     return i;
  23.                 }
  24.  
  25.              }
  26.         }
  27.         return 0;
  28.  
  29.     }
  30.     public static boolean isPrime(int i){
  31.         for(int j=2;j<i;j++){
  32.             if(i%j==0){
  33.                 return false;
  34.             }
  35.         }
  36.         return true;
  37.     }
  38.     public static boolean isPalindrom(int i){
  39.         int num=i,rem;
  40.         int revnum=0;
  41.         while(num>0){
  42.             rem=num%10;
  43.             revnum=revnum*10+rem;
  44.             num=num/10;
  45.         }
  46.         if(i==revnum){
  47.         return true;
  48.         }
  49.         else{
  50.         return false;
  51.         }
  52.     }
  53. }
Runtime error #stdin #stdout #stderr 0.06s 711680KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Exception in thread "main" java.util.NoSuchElementException
	at java.util.Scanner.throwFor(Scanner.java:862)
	at java.util.Scanner.next(Scanner.java:1485)
	at java.util.Scanner.nextInt(Scanner.java:2117)
	at java.util.Scanner.nextInt(Scanner.java:2076)
	at Ideone.main(Main.java:13)
https://ideone.com/VFjxoE
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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