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N-th number whose digits are all 3, 5 or 6
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A good number is a positive integer whose decimal digits are all 3, 5 or 6: 3, 5, 6, 33, 35, 36, 53, ... Given n, return the n-th good number. Notice the link to counting in base 3 so you can compute it directly instead of generating every number.
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