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A115537
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Numbers k such that the concatenation of 4*k with k gives a square.
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0
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17728531856, 27700831025, 39889196676, 54293628809, 70914127424, 89750692521, 32653061224489796, 73469387755102041, 1245674740484429065743944636678200692041522491349481
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