Problem 1166
Your goal is to determine a value of x such that when x3 and x4 are calculated that together all ten digits are produced exactly once. Once you determine x, enter the value of x4 as your answer. For example, if x = 3 then 33 and 34 produce 27 and 81 which is only 4 of the 10 digits (1, 2, 7 and 8) but you would enter 81.
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