nofzingerjustin4310 nofzingerjustin4310

11-01-2023
Mathematics

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To get the echo of a positive integer, we write it twice in a row without a space. For example, the echo of 2023 is 20232023. Is there a positive integer whose echo is a perfect square? if so, how many such positive integers can you find? if not, explain why not.

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