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All odd digit (Posted on 2020-10-05) Difficulty: 2 of 5
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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Solution without formal proof | Comment 1 of 6
There are only two:  1 and 3.
Tested by a computer program up to n=10,000,000

  Posted by Larry on 2020-10-05 09:05:15
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