VTMO 2026 - Grade 5 - Semifinal - SET 8 - Self-study Question 7

In a village, no house number may contain the digit 3. The rule says that “odd digits” are used to number the houses on the right side of the road in increasing order: the first is 1 and the second is 5. What is the number of the fifteenth house on that side?

Practice clarification: the house numbers must be odd numbers; their individual digits, other than the forbidden 3, may be even.