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  1. class M{
  2.   static boolean c(int n){
  3.     return n < 2 | p(n)
  4.             ? 0 > 1 //false
  5.             : d(n) == f(n);
  6.   }
  7.  
  8.   // Sums digits of int
  9.   static int d(int n) {
  10.     return n > 9
  11.             ? n%10 + d(n/10)
  12.             : n;
  13.   }
  14.  
  15.   // Convert int to sum of prime-factors
  16.   static int f(int n) {
  17.     int r = 0,
  18.         i;
  19.     for(i = 1; ++i <= n; ){
  20.       for( ; n % i < 1; n /= i,
  21.                         r += i > 9 ? d(i) : i);
  22.     }
  23.     return r;
  24.   }
  25.  
  26.   // Checks if the int is a prime
  27.   static boolean p(int n){
  28.     int i = 2;
  29.     while(i < n){
  30.       n = n % i++ < 1
  31.            ? 0
  32.            : n;
  33.     }
  34.     return n > 1;
  35.   }
  36.  
  37.   public static void main(String[] a){
  38.     System.out.println(c(18));
  39.     System.out.println(c(22));
  40.     System.out.println(c(13));
  41.     System.out.println(c(666));
  42.     System.out.println(c(-256));
  43.     System.out.println(c(0));
  44.     System.out.println(c(1));
  45.     System.out.println(c(4937775));
  46.   }
  47. }
Success #stdin #stdout 0.04s 711168KB
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false
true
false
true
false
false
false
true
https://ideone.com/1ihqJd
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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