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Concatenated Pandigital (Posted on 2023-09-23) Difficulty: 2 of 5
Find all positive integers N such that the concatenation of N and 7N contains each of the 10 digits exactly once.

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  Subject Author Date
Puzzle AnswerK Sengupta2023-09-23 17:18:55
Solutioncomputer solutionCharlie2023-09-23 08:58:01
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