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Task/Iterated-digits-squaring/Java/iterated-digits-squaring.java

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+import java.util.stream.IntStream;
+
+public class IteratedDigitsSquaring {
+
+    public static void main(String[] args) {
+        long r = IntStream.range(1, 100_000_000)
+                .parallel()
+                .filter(n -> calc(n) == 89)
+                .count();
+        System.out.println(r);
+    }
+
+    private static int calc(int n) {
+        while (n != 89 && n != 1) {
+            int total = 0;
+            while (n > 0) {
+                total += Math.pow(n % 10, 2);
+                n /= 10;
+            }
+            n = total;
+        }
+        return n;
+    }
+}