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A115541
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Numbers n such that the concatenation of 5*n with n gives a square.
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1020408163265306122449, 4081632653061224489796, 9183673469387755102041, 106678449690695619239994950132559020325716449943188991289, 123721752304002019946976391869713420022724403484408534276
(list; graph; refs; listen; history; internal format)
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