Explicación paso a paso:
3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60 , 63, 66, 69, 72, 75, 78, 81, 84, 87, 90, 93, 96, 99
