PreprintCC BY 4.0arXiv
Error Term Estimates for Sets of Remainders
Abstract
For a positive integer n, let S1(n)={nbmod k:1≤ k≤⌊ n/2⌋}, s1(n)=|S1(n)|. Baraskar and Vukusic proved s1(n)=Ξn+O(n/(log nloglog n)) for an explicit positive constant Ξ, and asked for a sharper error term. Their computations suggested that an O(n1/3) bound might hold. We prove that, for every α>√2, limsupn→∞ (s1(n)−Ξn)/(nexp{−α√(log nloglog n)}) =∞, and the corresponding limit inferior is −∞. In particular, no fixed power saving is possible. We also prove the complementary upper estimate s1(n)=Ξn+O( nexp{−α√(log nloglog n)} ) for every fixed α∈ (0,√2), sharpening the previous O(n/(log nloglog n)) bound. Thus, the constant √2 is the threshold for bounds of the form nexp{−α√(log nloglog n)}.
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BibTeX
@misc{baraskar2026error,
title = {{Error Term Estimates for Sets of Remainders}},
author = {Omkar Baraskar and Prashant Gokhale and Sarvagya Jain and Adam Kieżun},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.04993},
eprint = {2610.04993},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.04993},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Error Term Estimates for Sets of Remainders
AU - Omkar Baraskar
AU - Prashant Gokhale
AU - Sarvagya Jain
AU - Adam Kieżun
PY - 2026
DA - 2026/10/04
PB - arXiv
DO - 10.48550/arxiv.2610.04993
UR - https://arxiv.org/abs/2610.04993
AB - For a positive integer n, let S_1(n)={nbmod k:1≤ k≤⌊ n/2⌋}, s_1(n)=|S_1(n)|. Baraskar and Vukusic proved s_1(n)=Ξn+O(n/(log nloglog n)) for an explicit positive constant Ξ, and asked for a sharper error term. Their computations suggested that an O(n^1/3) bound might hold. We prove that, for every α>√2, limsup_n→∞ (s_1(n)−Ξn)/(nexp{−α√(log nloglog n)}) =∞, and the corresponding limit inferior is −∞. In particular, no fixed power saving is possible. We also prove the complementary upper estimate s_1(n)=Ξn+O( nexp{−α√(log nloglog n)} ) for every fixed α∈ (0,√2), sharpening the previous O(n/(log nloglog n)) bound. Thus, the constant √2 is the threshold for bounds of the form nexp{−α√(log nloglog n)}.
ER -