Abstract
For a fixed integer s≥1, we estimate exponential sums with harmonic sums individually and on average, where H s (n) is computed modulo a prime p. These bounds are used to derive new results about various congruences modulo p involving H s (n). For example, our estimates imply that for any ɛ>0, the set {H s (n):n<p1/2+ɛ} is uniformly distributed modulo a sufficiently large p. We also show that every residue class λ can be represented as with max{n ν |ν=1,. . . , 7}≤p11/12+ɛ, and we obtain an asymptotic formula for the number of such representations. The same results hold also for the values B p − r (n) of Bernoulli polynomials where r is fixed, complementing some results of W. L. Fouche.
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During the preparation of this paper, F. L. was supported in part by grants SEP-CONACYT 37259-E and 37260-E, and I. S. was supported in part by ARC grant DP0211459.
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Garaev, M., Luca, F. & Shparlinski, I. Distribution of harmonic sums and Bernoulli polynomials modulo a prime. Math. Z. 253, 855–865 (2006). https://doi.org/10.1007/s00209-006-0939-5
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DOI: https://doi.org/10.1007/s00209-006-0939-5