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A seemingly simple puzzle took me down a rabbit hole. Find a number that grows exactly $\frac{3}{2}$ times when the first digit becomes the last digit. For example, turning first digit into the last digit looks like this: 1 234 → 234 1 . For brevity, let's call it rotating the number. Solving with Brute force The first idea that comes to mind. After all, the computer can check millions of…
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