update,

ttng1234/Q2/step3.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python
+
+test_list = [ 21,9,17,10 ]
+
+def triangular_sequence(test_number):
+    # test_number represent the number that sequence should stop at.
+    
+    # Initialize the sequence with the first number
+    sequence = [1]
+    
+    # Generate the Triangular sequence
+    keep_find = True
+    i = 2
+    while keep_find:
+        next_num = sequence[-1] + i
+        keep_find = next_num < test_number
+        sequence.append(next_num)        
+        i = i + 1
+        
+    return next_num == test_number
+
+def check_mathematical_series(n: int) -> str:
+    print(triangular_sequence(n))
+
+for n in test_list:
+    check_mathematical_series(n)