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A115543
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Numbers n such that the concatenation of n with 6*n gives a square.
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0
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1, 20408163265306122448979591836734694, 81632653061224489795918367346938776, 20408163265306122448979591836734693877551020408163265306122448979591836734694
(list; graph; refs; listen; history; internal format)
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