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The number n in n^2 (Posted on 2019-04-11) Difficulty: 3 of 5
5 is in 52=25, but 5 is at the end of 25. 10 is in 102=100, but 100 ends in 0. What is the smallest positive integer n such that n is in n2, and there is at least one nonzero digit after n in n2?

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  Subject Author Date
in BasicCharlie2019-04-11 15:27:08
Solutioncomputer-assisted solutionPaul2019-04-11 15:22:45
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