Data commit

Task/Increasing-gaps-between-consecutive-Niven-numbers/Java/increasing-gaps-between-consecutive-niven-numbers.java

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+public class NivenNumberGaps {
+
+    //  Title:  Increasing gaps between consecutive Niven numbers
+
+    public static void main(String[] args) {
+        long prevGap = 0;
+        long prevN = 1;
+        long index = 0;
+        System.out.println("Gap      Gap Index   Starting Niven");
+        for ( long n = 2 ; n < 20_000_000_000l ; n++ ) {
+            if ( isNiven(n) ) {
+                index++;
+                long curGap = n - prevN;
+                if ( curGap > prevGap ) {
+                    System.out.printf("%3d  %,13d  %,15d%n", curGap, index, prevN);
+                    prevGap = curGap;
+                }
+                prevN = n;
+            }
+        }
+    }
+
+    public static boolean isNiven(long n) {
+        long sum = 0;
+        long nSave = n;
+        while ( n > 0 ) {
+            sum += n % 10;
+            n /= 10;
+        }
+        return nSave % sum == 0;
+    }
+
+}