n * k = dd0d00d where d = ...? – codegolf.stackexchange.com

n * k = dd0d00d where d = ...? – codegolf.stackexchange.com

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Given a positive integer n ≤ 500: Find the smallest positive integer k such that all digits in the decimal representation of n*k are either 0 or d, with 1 ≤ d ≤ 9. Print or return d in less than 30 ...

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