Estimating The Density of Harshad Numbers
If we let N(x) denote the number of Harshad numbers ≤ x, then for any given ε > 0,
as shown by Jean-Marie De Koninck and Nicolas Doyon; furthermore, De Koninck, Doyon and Kátai proved that
where c = (14/27) log 10 ≈ 1.1939.
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