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A115553
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Numbers n such that the concatenation of n with 9*n gives a square.
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2041, 8164, 2366863905325444, 5325443786982249, 9467455621301776, 2040816326530612244897959183673469387755102041, 8163265306122448979591836734693877551020408164
(list; graph; refs; listen; history; internal format)
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