[Euler] Add solution for #168.

Author: shlomif

euler/prob168-shlomif.p6

@@ -0,0 +1,26 @@
+use v6;
+
+my $sum = 0;
+# $multiplier is "d"
+for 1 .. 9 -> $multiplier
+{
+    for 1 .. 99 -> $L
+    {
+        # $digit is m.
+        for 1 .. 9 -> $digit
+        {
+            my $n = (((10 ** $L - $multiplier)*$digit)/(10*$multiplier - 1));
+
+            my $number_to_check = $n * 10 + $digit;
+            if ($n.chars() == $L and ($multiplier * $number_to_check
+                    == $n + $digit * 10 ** $L))
+            {
+                print "Found $number_to_check\n";
+                $sum += $number_to_check;
+                print "Sum = $sum\n";
+            }
+        }
+    }
+}
+
+print "Last 5 digits of the final sum are: ", "$sum".substr(*-5), "\n";