Question

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Answer 1

Answer:

What is the complete set of 10-digit numbers using each value (00-99) once, such that the first nn digits form a number divisible by nn (for n∈{1,2,...,10}n∈{1,2,...,10})?

E.g. if the number were 12345678901234567890, 11 must be divisible by 11, 1212 must be divisible by 22, 123123 must be divisible by 33, etc...