Problem 51337. Number Puzzle - 109

Let a be an integer and b is equal to a+4. Let c be an integer formed by concatenating a and b. Give examples of four unique a for which c is a square. Give your answer in the following form y=[a1 a2 a3 a4].
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83.87% Correct | 16.13% Incorrect
Last Solution submitted on Jan 30, 2026

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