Find the 4 digit number
- Its a perfect square
- Remove the 2nd digit an it is still a perfect square
- Add 3 to the second digit and again you get a perfect square
- Replace the first 2 digits by one of its factor and you get a perfect square again1
- Its a perfect square
- Remove the 2nd digit an it is still a perfect square
- Add 3 to the second digit and again you get a perfect square
- Replace the first 2 digits by one of its factor and you get a perfect square again1
5429
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