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All odd digit (Posted on 2020-10-05)

Find all positive integers n such that the decimal representation of n² consists of odd digits only.

No Solution Yet Submitted by Danish Ahmed Khan

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Puzzle Answer

Comment 7 of 7 |

1 and 3 are the only two positive integers that satisfy all the given conditions.

* I hope to posit an independent explanation for this in future.

Posted by K Sengupta on 2022-05-10 22:02:11

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