26 Jun 2013
Numbers with Additude: Middle Secondary Mathematics Competition Question
For example, starting with the number 5678 we obtain the sequence (5678, 26, 8). So the number 5678 has a digital root of 8 and an additude of 2. The number 8 has a digital root of 8 and an additude of 0.
Find the smallest possible number that has a digital root of 7 and an additude of 3.