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An asymptotic formula for the average sum of the digits of integers. - MaRDI portal

An asymptotic formula for the average sum of the digits of integers. (Q2589573)

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An asymptotic formula for the average sum of the digits of integers.
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    An asymptotic formula for the average sum of the digits of integers. (English)
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    \(s(r, n)\) (wo \(r > 1\) ganz) sei die Summe der Ziffern in der \(r\)-adischen Darstellung der ganzen Zahl \(n \geqq 0\); d. h. \[ s(r, n) = a_0 + a_1 + \cdots + a_k, \;\text{ wenn } \;n = a_0+ a_1r+ \cdots + a_kr^k \quad (0 \leqq a_j < r, \;a_j \text{ ganz}). \] Dann folgt sehr leicht \[ \sum_{n=0}^{N-1} s(r,n)\sim \frac {r-1}{2\log \, r} N \log \, N \quad \text{ für } \quad N \to \infty . \]
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