Find the sum of the first N Centered Octagonal Number | Function to find N - th Centered Octagonal number ; Formula to calculate nth centered Octagonal number ; Function to find the sum of the first N Centered Octagonal numbers ; Variable to store the sum ; Iterating through the first N numbers ; Driver code
def center_Octagonal_num ( n ) : NEW_LINE INDENT return ( 4 * n * n - 4 * n + 1 ) NEW_LINE DEDENT def sum_center_Octagonal_num ( n ) : NEW_LINE INDENT summ = 0 NEW_LINE for i in range ( 1 , n + 1 ) : NEW_LINE INDENT summ += center_Octagonal_num ( i ) NEW_LINE DEDENT return summ NEW_LINE DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT n = 5 NEW_LINE print ( sum_center_Octagonal_num ( n ) ) NEW_LINE DEDENT