diff --git a/smallestRepunitDivByK.java b/smallestRepunitDivByK.java
new file mode 100644
index 00000000..d39cc3c6
--- /dev/null
+++ b/smallestRepunitDivByK.java
@@ -0,0 +1,19 @@
+class Solution {
+    public int smallestRepunitDivByK(int k) {
+        if(k == 2 || k == 5)
+        {
+            return -1;
+        }
+
+        int rem = 0;
+        for(int length = 1; length<=k; length++)
+        {
+            rem = (rem*10 + 1) % k;   // simulate adding a '1'
+            if(rem == 0)
+            {
+                return length;
+            }
+        }
+        return -1;
+    }
+}