Number puzzle
Magic number
Arrange the digits 1 to 9, each used once, so that the first two digits make a number divisible by 2, the first three divide by 3, and so on down to all nine dividing by 9. Exactly one arrangement works.
Divisibility checks
- ÷ 2
- ÷ 3
- ÷ 4
- ÷ 5
- ÷ 6
- ÷ 7
- ÷ 8
- ÷ 9
A number whose every leading chunk divides evenly like this is called polydivisible. Among all 362,880 ways to line up the digits 1-9, just one is - the checks above light up green the moment you find it.
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