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Task/Pernicious-numbers/Java/pernicious-numbers.java

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+public class Pernicious{
+    //very simple isPrime since x will be <= Long.SIZE
+    public static boolean isPrime(int x){
+        if(x < 2) return false;
+        for(int i = 2; i < x; i++){
+            if(x % i == 0) return false;
+        }
+        return true;
+    }
+
+    public static int popCount(long x){
+        return Long.bitCount(x);
+    }
+
+    public static void main(String[] args){
+        for(long i = 1, n = 0; n < 25; i++){
+            if(isPrime(popCount(i))){
+                System.out.print(i + " ");
+                n++;
+            }
+        }
+
+        System.out.println();
+
+        for(long i = 888888877; i <= 888888888; i++){
+            if(isPrime(popCount(i))) System.out.print(i + " ");
+        }
+    }
+}