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Found problems: 1

2018 Rio de Janeiro Mathematical Olympiad, 1
A natural number is a [i]factorion[/i] if it is the sum of the factorials of each of its decimal digits. For example, $145$ is a factorion because $145 = 1! + 4! + 5!$. Find every 3-digit number which is a factorion.
factorial rio algebra