diff --git a/src/Helpers/SequenceCalculator/QuintupleSequenceCalculator.php b/src/Helpers/SequenceCalculator/QuintupleSequenceCalculator.php
new file mode 100644
index 0000000..38939da
--- /dev/null
+++ b/src/Helpers/SequenceCalculator/QuintupleSequenceCalculator.php
@@ -0,0 +1,25 @@
+<?php
+/**
+ * 五倍回傳計算數列
+ */
+
+namespace Mouson\Helpers\SequenceCalculator;
+
+class QuintupleSequenceCalculator implements CalculatorInterface
+{
+
+    /**
+     * @param $value
+     *
+     * @return int|mixed
+     */
+    public function calculate($value)
+    {
+        return ($value * 5);
+    }
+
+    public function getSequenceName()
+    {
+        return 'Quintuple';
+    }
+}
\ No newline at end of file
diff --git a/tests/Mouson/Helpers/SequenceCalculator/QuintupleSequenceCalculatorTest.php b/tests/Mouson/Helpers/SequenceCalculator/QuintupleSequenceCalculatorTest.php
new file mode 100644
index 0000000..eb0c6ea
--- /dev/null
+++ b/tests/Mouson/Helpers/SequenceCalculator/QuintupleSequenceCalculatorTest.php
@@ -0,0 +1,21 @@
+<?php
+namespace Mouson\Helpers\SequenceCalculator;
+
+class QuintupleSequenceCalculatorTest extends \PHPUnit_Framework_TestCase
+{
+    public function test_物件產生後應可以取得物件名稱()
+    {
+        /** Arrange */
+        $target = new QuintupleSequenceCalculator();
+
+        /** Assume */
+        $expected = 'Quintuple';
+
+        /** Act */
+        $actual = $target->getSequenceName();
+
+        /** Assert */
+        $this->assertEquals($expected, $actual);
+    }
+
+}