the sum of three consecutive odd numbers is 129? what is the smallest of the three number?

(2k + 1 ) + ( 2k + 3) + ( 2k + 5 ) = 129 ; 6k + 9 = 129 ; 6k = 120 ; k = 20 ; 2 * 20 + 1 = 41 is the smallest of three consecutive odd numbers ;