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  • June 5, 2020 at 2:53 pm #72587
    Khushi Sharma
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    For any natural number n, expressed in base 10, let S(n) denote the sum of all digits of n. Find all natural numbers n such that n=2S(n)2 .(RMO-2016)

    June 5, 2020 at 5:19 pm #72612
    Saumik Karfa
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