How to start?
Number Theory
Level
2
Hummus gives clues about his six-digit secret number:
- Clue 1: It is the same number if you read it from right to left.
- Clue 2: The number is a multiple of 9.
- Clue 3: Cross off the first and last digits. The only prime factor of the remaining four-digit number is 11.
What is Hummus’s six-digit number?
by
Hummus a