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TUYMAADA 2020 J7

    How many positive integers NN in the segment [10,1020]\left[10, 10^{20} \right] are such that if all their digits are increased by 11 and then multiplied, the result is N+1N+1 ?

    (F. Bakharev)

    Dataset text AI-MO AoPS. Quoted with source.

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