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A115541
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Numbers k such that the concatenation of 5*k with k gives a square.
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0
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1020408163265306122449, 4081632653061224489796, 9183673469387755102041, 106678449690695619239994950132559020325716449943188991289, 123721752304002019946976391869713420022724403484408534276
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OFFSET
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1,1
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LINKS
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EXAMPLE
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5102040816326530612245_1020408163265306122449 = 7142857142857142857143^2.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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