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Mathematics 7 Online
OpenStudy (anonymous):

Find all 8-digit natural numbers n such that n^2 ends in the same 8 digits as n. Numbers are written in standard decimal notation, with no leading zeroes. Find all 8-digit natural numbers n such that n^2 ends in the same 8 digits as n. Numbers are written in standard decimal notation, with no leading zeroes. @Mathematics

OpenStudy (mathmagician):

12890625 and 87109376

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