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| The number n in n^2 (Posted on 2019-04-11) |
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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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Submitted by Math Man
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